Ask The Expert

Mari Gallagher, founder and principal of Mari Gallagher Research & Consulting Group, is a nationally recognized expert in food access, grocery market analysis, hyperlocal data modeling, and community health impacts. Her original food desert research raised national awareness about inequitable food access and its impacts on public health and market conditions. Her seminal Chicago food desert report encouraged Congressional action and investment into underserved communities.

Today, the “desert” metaphor from that work continues to shape public dialogue around other forms of scarcity and disinvestment, including pharmacy deserts, bank deserts, and public transit deserts.

Her firm also created a unique hyperlocal “missing meals” model, the Meal Deficit Metric (MDM), which quantifies unmet food need after accounting for all ways households receive groceries or meals, including government programs and charitable food sources. The model is designed to support both market and community-based solutions.

Mari continues to influence public policy, community development, and market initiatives nationwide through research and strategy grounded in both rigorous analysis and real-world implementation.

What is a food desert? Mari Gallagher Research & Consulting Group (MG), known as Food Desert research experts, defines Food Deserts as large geographic areas that have no or distant mainstream grocery stores.

Does this mean that there is no food at all in the Food Desert? No, quite the contrary. Often, Food Deserts have an imbalance of food choices, meaning a heavy concentration of nearby fringe food that is high in salt, fat, and sugar. Many fringe locations also offer “quick meals” that are very convenient but cannot support a healthy diet on a regular basis. The study of Food Deserts is crucial for every type of community – urban, suburban, and rural – because findings from our food retail market research reveal that residents of Food Deserts can suffer worse diet-related health outcomes, including diabetes, cancer, cardiovascular, and other diseases, as well as premature death. These effects are independent of other contributing factors such as income, race, age, and education.

We popularized the term “Food Desert” in 2006. The USDA subsequently created its own definition, and ours differs greatly from it. The USDA limits its definition of Food Desert to a low-income Census tract wherein at least 500 and/or 33% of residents live more than one mile or 10 miles from a supermarket in an urban or rural community, respectively. On the other hand, MG does not exclude areas based on income. Our analysis is at the Census block group level whenever possible. The clustering of poor access blocks is a key factor in determining the status of Food Desert, and we do not believe that there is a perfect distance to a grocery store for urban, suburban, and rural communities. Each community is unique, and we must determine, in each instance, the ideal thresholds concerning market offerings and their associated contributions to public health. As part of our services, we also provide Food Desert mapping services to better understand these areas and their impact on public well-being.

In short: There is no single solution to food deserts because every community has unique market conditions, demographics, infrastructure, consumer needs, market behavior, and other characteristics.

Mari Gallagher’s work emphasizes that successful solutions must combine community development, market analysis, and market-based strategies. Communities are unique and require a custom assessment and approach.

Attracting and retaining quality grocers is critical. However, long-term success also depends on factors such as neighborhood safety, transportation access, the strengthening of purchasing power, supportive public policy, and complementary retail development.

Effective solutions are data-driven and focused on strengthening the broader community ecosystem, not simply placing a grocery store in isolation.

Mari Gallagher, founder and principal of Mari Gallagher Research & Consulting Group, is a nationally recognized expert in food access, grocery market analysis, hyperlocal data modeling, and community health impacts. Her original food desert research raised national awareness about inequitable food access and its impacts on public health and market conditions. Her seminal Chicago food desert report encouraged Congressional action and investment into underserved communities.

Today, the “desert” metaphor from that work continues to shape public dialogue around other forms of scarcity and disinvestment, including pharmacy deserts, bank deserts, and public transit deserts.

Her firm also created a unique hyperlocal “missing meals” model, the Meal Deficit Metric (MDM), which quantifies unmet food need after accounting for all ways households receive groceries or meals, including government programs and charitable food sources. The model is designed to support both market and community-based solutions.

Mari continues to influence public policy, community development, and market initiatives nationwide through research and strategy grounded in both rigorous analysis and real-world implementation.

What is a food desert? Mari Gallagher Research & Consulting Group (MG), known as Food Desert research experts, defines Food Deserts as large geographic areas that have no or distant mainstream grocery stores.

Does this mean that there is no food at all in the Food Desert? No, quite the contrary. Often, Food Deserts have an imbalance of food choices, meaning a heavy concentration of nearby fringe food that is high in salt, fat, and sugar. Many fringe locations also offer “quick meals” that are very convenient but cannot support a healthy diet on a regular basis. The study of Food Deserts is crucial for every type of community – urban, suburban, and rural – because findings from our food retail market research reveal that residents of Food Deserts can suffer worse diet-related health outcomes, including diabetes, cancer, cardiovascular, and other diseases, as well as premature death. These effects are independent of other contributing factors such as income, race, age, and education.

We popularized the term “Food Desert” in 2006. The USDA subsequently created its own definition, and ours differs greatly from it. The USDA limits its definition of Food Desert to a low-income Census tract wherein at least 500 and/or 33% of residents live more than one mile or 10 miles from a supermarket in an urban or rural community, respectively. On the other hand, MG does not exclude areas based on income. Our analysis is at the Census block group level whenever possible. The clustering of poor access blocks is a key factor in determining the status of Food Desert, and we do not believe that there is a perfect distance to a grocery store for urban, suburban, and rural communities. Each community is unique, and we must determine, in each instance, the ideal thresholds concerning market offerings and their associated contributions to public health. As part of our services, we also provide Food Desert mapping services to better understand these areas and their impact on public well-being.

In short: There is no single solution to food deserts because every community has unique market conditions, demographics, infrastructure, consumer needs, market behavior, and other characteristics.

Mari Gallagher’s work emphasizes that successful solutions must combine community development, market analysis, and market-based strategies. Communities are unique and require a custom assessment and approach.

Attracting and retaining quality grocers is critical. However, long-term success also depends on factors such as neighborhood safety, transportation access, the strengthening of purchasing power, supportive public policy, and complementary retail development.

Effective solutions are data-driven and focused on strengthening the broader community ecosystem, not simply placing a grocery store in isolation.

In short: Food deserts can be associated with negative health impacts, but the effects are not identical across all communities.

We have found negative diet-related health impacts in studies of different urban, rural, and suburban areas from the absence of grocery stores, while controlling for other contributing factors. However, this does not mean the same findings can be generalized across every community with food desert conditions.

The impacts we have discovered are also not equal. In some communities, we found statistically significant links to diet-related diabetes; in others, cardiovascular disease; elsewhere, brain cancers and diet-related liver disease. In one rural county in Iowa, we found impacts on school children’s height and academic performance.

Each community is unique, and many factors contribute to quality and length of life. Understanding impacts in a specific community requires a statistical analysis that controls for other contributing factors, and in some cases there may be too much “noise” in the data to draw strong conclusions.

The news, policy makers, community actors, and others often cite other types of “deserts” to describe community lack. How did this come about and what other types of “deserts” are there?

Two-word terms indicating scarcity or lack that include “desert” were popularized through Mari Gallagher’s groundbreaking food desert research, which identified areas where residents did not have adequate geographic access to a grocery store. “Food desert” quickly became a widely recognized concept.

Over time, the framework expanded to describe other forms of community scarcity, lack, and disinvestment. Examples now include pharmacy deserts, bank deserts, transit deserts, and entertainment deserts.

Today, these terms are commonly used to describe different forms of geographic scarcity across communities.

A pharmacy desert refers to areas with limited access to a physical pharmacy store that provides in-person prescriptions, consultations, vaccinations, and related health services. 

A bank desert describes communities where the closest physical bank branch is very distant. 

A transit desert refers to places with inadequate public transportation access relative to community need and untapped opportunities to serve it.

An entertainment desert is an area where the closest entertainment option considered common in most other communities, such as a movie theater, is very distant.

Like Mari Gallagher’s determination of food deserts, concluding that an area is some type of scarcity desert requires examining conditions across a larger region and then conducting statistical analysis. 

To understand whether deserts affect diet-related health, quality of life, mobility, access, or other conditions, the analysis must be expanded to include additional detailed data. 

For example, when assessing diet-related impacts, we include detailed health and mortality data and control for many other contributing factors.

Two-word terms indicating scarcity or lack that include “desert” were popularized through Mari Gallagher’s groundbreaking food desert research, which identified areas where residents did not have adequate geographic access to a grocery store. “Food desert” quickly became a widely recognized concept.

Over time, the framework expanded to describe other forms of community scarcity, lack, and disinvestment. Examples now include pharmacy deserts, bank deserts, transit deserts, and entertainment deserts.

Today, these terms are commonly used to describe different forms of geographic scarcity across communities.

In short: No. There is no single distance that perfectly defines a food desert.  

As a response to Mari Gallagher’s 2006 report, which brought national attention to food deserts and their health impacts, the USDA created a food desert map and locator and adopted thresholds of more than 1 mile in urban areas and more than 10 miles in rural areas. 

However, Mari Gallagher’s research argues that a one-size-fits-all approach is not appropriate because communities differ dramatically in their market conditions, transportation systems, land-use patterns, and consumer behavior.

In short: Because every community is different.

There is no universal “ideal” distance to a grocery store. Urban, suburban, and rural communities have distinct market, land-use, transportation, and cultural patterns.

Grocer locations should be evaluated both individually and across broader hyper-local geographic patterns to determine whether food deserts exist and what distance thresholds make sense for that specific community.

Some people initially expect an easy, blanket definition of food access or a short list of universal solutions. While well-intentioned, that approach can do more harm than good.

Each assessment should be conducted with care and customized to local conditions. The same is true for grocer recruitment and retention strategies, which require highly localized market analysis.

In short: Mari Gallagher developed a coding system to distinguish between SNAP retailers that meaningfully support healthy food access and those that do not.

Mari Gallagher developed a system to review SNAP-authorized retailers individually to determine whether they meet the USDA’s food requirements and then assigns codes that reflect their role in supporting healthy food access.

She was among the first researchers to publicly demonstrate that many SNAP-authorized retailers are not traditional grocery stores and that many fail to meet even the program’s minimum food requirements. Examples include some liquor stores, gas stations, convenience stores, and other retailers.

This coding system provides a more accurate picture of the neighborhood food environment than simply counting every SNAP retailer equally.

Learn More

• TED Talk
• Open Letter to the White House
• SNAP Retailer Blog

In short: Mari Gallagher generally classifies SNAP retailers as Mainstream, Fringe, or occasionally Neutral.

After evaluating individual SNAP-authorized retailers, Mari Gallagher assigns one of three classifications based on how well the store supports healthy, long-term food access.

The primary classifications are:

• Mainstream
• Fringe

In some situations, a third classification, Neutral, is used.

SNAP-authorized retailers include far more than grocery stores. Examples include convenience stores, liquor stores, dollar stores, pharmacies, gas stations, department stores, and, in some locations, restaurants.

Mari Gallagher’s coding system helps distinguish retailers that truly strengthen healthy food access from those that primarily provide limited or supplemental food options.

In short: A Fringe Food Store is a retailer that offers limited healthy food choices and does not adequately support long-term nutritional needs.

Mari Gallagher’s research distinguishes between Mainstream Food Stores and Fringe  Food Stores when evaluating neighborhood food environments.

Fringe food stores may technically sell food but generally offer limited fresh foods, reduced healthy options, and a narrow selection of staple groceries. Examples can include some convenience stores, dollar stores, liquor stores, gas stations, and small corner stores.

Many specialize in highly processed foods that are high in sodium, sugar, and unhealthy fats while offering little fresh produce, meat, dairy, or other nutritious staples.

Although fringe retailers can provide convenience and supplemental food access, Mari Gallagher’s work examines whether they adequately support long-term community nutrition compared to mainstream food stores.

In Mari Gallagher’s research, Mainstream SNAP-authorized retailers typically offer a wide variety of healthy, affordable foods, including:

• Fresh fruits and vegetables
• Meat and poultry
• Dairy products
• Staple grocery items
• Other foods that support a healthy diet

A mainstream store does not have to be large. Small neighborhood grocers may also qualify if they consistently provide healthy food options and maintain regular business hours.

These stores serve as important community anchors because they offer greater food variety, nutritional value, and pricing stability than fringe food retailers.

In short: A Neutral Food Store neither significantly strengthens nor weakens healthy food access.

Occasionally, Mari Gallagher classifies a SNAP-authorized retailer as Neutral.

A neutral retailer does not substantially improve or diminish healthy food access within a community.

Pharmacies are a common example. While pharmacies typically provide medications, vaccinations, and valuable health services, food is generally not their primary purpose. After individual assessment, many pharmacies are classified as Neutral.

In short: Pharmacies may participate in SNAP if they meet federal retailer requirements.

Many pharmacies choose to participate in SNAP because accepting SNAP benefits can increase customer traffic and sales of both food and non-food items.

Whether an individual pharmacy meets SNAP requirements must be evaluated on a store-by-store basis. As with every SNAP retailer, Mari Gallagher assesses each location individually. In many cases, pharmacies are ultimately coded as Neutral.

Another long-standing challenge is that Congress has not consistently funded sufficient oversight to verify retailer compliance with SNAP requirements.

Learn More

• Open Letter to the White House

Community pharmacies typically provide:

• Prescription medications
• Vaccinations
• Over-the-counter medications
• Medication counseling
• Health consultations

Some pharmacies operate as standalone businesses, while others are located inside grocery stores, warehouse clubs, or other retailers.

Standalone pharmacies are often especially important for older adults, individuals with disabilities, and residents with limited transportation. These locations may be easier to reach and navigate than large retail stores.

Many residents also prefer speaking directly with a pharmacist rather than relying on online ordering or home delivery. In neighborhoods with higher theft rates, in-person pickup may also feel more secure than delivered medications.

While home delivery offers convenience for many households, in-person pharmacy access remains essential for numerous communities.

In short: Yes. Communities may experience overlapping challenges that affect both health and quality of life.

When a community loses both grocery stores and pharmacies, residents may face reduced access to nutritious food, medications, preventive care, vaccinations, and trusted healthcare guidance.

The combined loss can place greater burdens on older adults, people with chronic health conditions, individuals without reliable transportation, and lower-income households.

Mari Gallagher’s work emphasizes that communities should examine these overlapping challenges together rather than treating food access and healthcare access as separate issues.

In short: Some liquor stores qualify to participate in SNAP under existing federal rules.

Many liquor stores choose to become SNAP-authorized retailers because participation can increase customer traffic and overall sales.

Whether a liquor store actually meets SNAP requirements should be determined on an individual basis. After assessment, many liquor stores are classified by Mari Gallagher as Fringe Food Stores.

Another long-standing concern is that Congress has not consistently funded adequate compliance monitoring. Without regular oversight, some retailers may remain in the program despite failing to meet requirements.

Learn More

• Open Letter to the White House
• SNAP Retailer Blog
• TED Talk

In short: No. Stronger standards alone are not enough.

Improving SNAP retailer requirements will not significantly improve compliance unless there is also a well-funded system for monitoring and enforcing those standards.

Because many SNAP-authorized retailers already fail to meet existing requirements, raising standards without increasing oversight could simply increase the number of retailers that remain non-compliant.

Mari Gallagher’s work argues that meaningful reform requires both stronger standards and effective enforcement.

In short: The USDA’s decision to discontinue its long-running food insecurity survey created a significant gap in national hunger data.

For nearly 30 years, the USDA’s annual food insecurity survey served as one of the nation’s most important tools for understanding hunger and food hardship. Researchers, charitable organizations, policymakers, and government agencies relied on the data to guide funding decisions, evaluate programs, and measure changes over time.

Its cancellation raised concerns about how communities would continue identifying and responding to unmet food needs.

Mari Gallagher has written that while the loss of this long-standing survey is significant, communities still require reliable, actionable local data. Her work emphasizes the importance of independent, hyperlocal models, such as the Meal Deficit Metric (MDM), that can continue measuring unmet food need despite changes in federal data collection.

Learn More

• The USDA Ended Its Annual Food Insecurity Survey, But Our Hyper-Local Data Model Will Continue
• Meal Deficit Metric (MDM)

In short: The Meal Deficit Metric (MDM) is Mari Gallagher’s hyperlocal statistical model for measuring unmet food need after accounting for all available food resources.

The Meal Deficit Metric (MDM) is a proprietary statistical model developed by Mari Gallagher Research & Consulting Group to measure unmet food need at highly localized geographic levels.

Unlike general food insecurity statistics, the MDM estimates the number of meals households are still missing after accounting for all known food sources, including:

• Earned income
• SNAP benefits
• WIC
• School meal programs
• Charitable food assistance
• Help from friends and family
• Other available food resources

Rather than simply identifying communities experiencing food hardship, the MDM quantifies how many meals remain unmet and precisely where those gaps exist.

This allows charitable organizations, government agencies, policymakers, and community leaders to allocate resources more strategically and efficiently.

Because the model draws from numerous validated data sources, not solely the discontinued USDA survey, it remains a reliable tool for measuring local food need.

Learn More

• Meal Deficit Metric (MDM)
• Public Reports

Mari Gallagher developed the terms Net Missing Meals and Meal Deficit to describe food need in a way that is both measurable and actionable.

These concepts quantify the actual number of meals households continue to miss after accounting for every known source of food support, including government programs, charitable assistance, earned income, and help from friends and family.

By comparison, the term food insecurity describes a broad range of experiences related to uncertainty or limited access to food. While useful for awareness and fundraising, it does not measure the remaining quantity of unmet food need.

Net Missing Meals provides communities with a clearer understanding of how much additional food is needed, where it is needed most, and how resources can be distributed more effectively.

In short: Recruiting a grocery store is only the beginning. Long-term success depends on keeping quality grocers in the community.

Mari Gallagher’s work emphasizes that attracting a grocery store is only part of the challenge. Retaining quality grocers over time is equally important.

Long-term grocer retention depends on a combination of factors, including:

• Neighborhood safety
• Transportation access
• Complementary retail
• Consumer purchasing patterns
• Infrastructure
• Market stability
• Local leadership

Her research frequently discusses how “Like Attracts Like” in retail environments. Strong retailers often perform better when located near other successful businesses that reinforce customer traffic and investment confidence.

Successful retention strategies typically require collaboration among retailers, local officials, economic development organizations, community leaders, and residents.

In short: The health measures vary depending on each community and research objective.

Mari Gallagher’s studies examine the relationship between food access, neighborhood retail conditions, and public health outcomes.

Depending on the project, health measures may include:

• Diabetes
• Obesity
• Hypertension
• Cardiovascular disease
• Diet-related cancers
• Liver disease
• Premature mortality
• Other health outcomes

Her work also considers broader social and environmental conditions that influence health, including poverty, transportation, neighborhood safety, housing, and retail quality.

Rather than relying on assumptions, each study uses statistical analysis to determine which health conditions are significantly associated with local market conditions.

In short: Mari Gallagher evaluates the complete community ecosystem, not just grocery
stores.

Her work inventories a wide range of community assets that influence neighborhood health, market viability, and quality of life.

Depending on the project, this may include:

• Grocery stores
• All SNAP-authorized stores
• Other businesses
• Pharmacies
• Buying power
• Consumer spending patterns
• Community organizations
• Churches
• Schools
• Healthcare facilities
• Transit access
• Housing conditions
• Neighborhood safety
• Home improvement activity
• Voting participation
• Community wealth
• Insurance rates
• Other local assets

The objective is to understand how these systems work together and how the presence, or absence, of key assets influences both community well-being and market performance.

In short: Healthy retail environments tend to attract more healthy retail, while struggling environments often reinforce additional decline.

Mari Gallagher’s research frequently discusses the principle of “Like Attracts Like.”

Successful retailers often benefit from locating near other successful retailers because customers value convenience, variety, safety, and complementary shopping opportunities.

Conversely, neighborhoods dominated by lower-quality retail may encourage additional lower-quality investment while discouraging mainstream businesses.

Consumer behavior follows similar patterns.

For example, neighborhoods with multiple quality grocery stores naturally encourage healthier purchasing habits because nutritious foods are more visible, accessible, and convenient.

Conversely, areas dominated by convenience stores, dollar stores, gas station marts, and fast-food outlets often reinforce less nutritious purchasing patterns.

This principle helps explain why improving one retailer alone is rarely enough. Long-term success depends on strengthening the broader retail environment.

In short: People generally purchase the food that is most convenient, not necessarily the food they would prefer to buy.

Mari Gallagher developed the Convenience Food Factor to explain how convenience strongly influences food purchasing behavior.

Convenience includes more than physical distance. It also includes:

• Travel time
• Ease of parking
• Store layout
• Time spent shopping
• Accessibility
• Overall shopping experience

Consumers often choose the option that is easiest and fastest, even when it lacks the healthy food option they would prefer.

Understanding convenience helps explain why improving neighborhood food access requires more than simply increasing the number of food retailers. Communities must also improve how easily residents can reach and use healthy food options.

In short: Yes. Neighborhood safety plays an important role in retail success, but it is only one part of the broader market picture.

Mari Gallagher’s research consistently recognizes neighborhood safety as an important factor influencing retail viability, investment decisions, operating costs, staffing, customer traffic, and long-term business stability.

Retailers may face challenges related to theft, property damage, insurance costs, employee recruitment, and customer perceptions in areas with persistent safety concerns.

At the same time, her work emphasizes that communities facing these challenges are often filled with residents who want exactly what residents everywhere want: safe neighborhoods, quality services, stable businesses, and healthy food options.

Successful retail strategies recognize both the challenges and the opportunities within every community.

Mari Gallagher includes all SNAP-authorized retailers in her market assessments because they collectively represent the food purchasing options available within a community.

While individual fringe retailers may seem insignificant compared to full-service grocery stores, their combined presence can substantially influence consumer purchasing patterns and neighborhood food markets.

Because many fringe retailers accept SNAP benefits, they often capture food spending that might otherwise support mainstream grocery stores if healthier options were more accessible.

Evaluating every SNAP-authorized retailer provides a more accurate understanding of neighborhood food environments and local market dynamics.

Retail Agglomeration is the tendency of businesses to cluster together because nearby retailers often increase customer traffic, convenience, market visibility, and overall commercial success.

Mari Gallagher frequently discusses this concept as part of her broader research on neighborhood retail dynamics.

Quality grocery stores often perform better when surrounded by complementary businesses, such as pharmacies, restaurants, banks, healthcare providers, and other community-serving retailers.

These retail clusters encourage additional investment, strengthen consumer confidence, increase shopping trips, and improve long-term market stability.

Retail Agglomeration is one of the principles supporting Mari Gallagher’s broader MG Snowball Effect, demonstrating how positive retail environments can reinforce continued investment.

In short: Positive retail conditions tend to create more positive retail conditions, while negative conditions often reinforce further decline.

The MG Snowball Effect describes how neighborhood retail environments evolve over time through cumulative market forces.
For example, when a quality grocery store opens, it may:

• Attract additional retailers
• Increase customer traffic
• Encourage private investment
• Improve neighborhood perception
• Strengthen local purchasing activity

Conversely, the loss of important retailers can reduce customer traffic, weaken investment confidence, and contribute to additional store closures.

Mari Gallagher’s research examines how these reinforcing patterns shape neighborhood retail, community investment, and long-term economic stability.

Understanding these dynamics helps communities develop strategies that encourage sustained, positive market growth.

In short: No. Grocery closures rarely have a single cause.

Mari Gallagher’s work emphasizes that grocery store closures are influenced by many factors beyond consumer demand alone.

Potential factors include:

• Competition
• Corporate restructuring
• Lease agreements
• Operating costs
• Neighborhood safety
• Staffing challenges
• Infrastructure
• Market shifts
• Broader economic conditions

A grocery closure should never automatically be interpreted as evidence that a community lacks demand for quality food retail.

Each situation requires careful, localized market analysis before drawing conclusions.

Mari Gallagher’s Food Balance Score evaluates neighborhood food environments by measuring the balance between Mainstream Food Stores and Fringe Food Stores.

Rather than simply counting stores, the score considers the distance from every census block to both the nearest mainstream food retailer and the nearest fringe food retailer.

This highly localized approach helps identify whether neighborhoods are food balanced or food imbalanced, providing communities with a more accurate picture of food access than traditional grocery counts alone.

The Food Balance Score is one component of Mari Gallagher’s broader body of work on food environments, neighborhood markets, and community health.

A Census Block Group is a relatively small geographic area made up of several ndividual census blocks.

The U.S. Census Bureau reviews Block Group boundaries approximately every ten years to reflect changes in population and development.

Mari Gallagher frequently uses Block Groups, and often even smaller geographic units, in her research because they provide much more detailed insight than larger geographic areas such as ZIP Codes, census tracts, or counties.

Analyzing data at this level helps uncover neighborhood patterns that would otherwise remain hidden.

In short: ZIP Codes are designed for mail delivery, not neighborhood analysis.

There are two primary types of ZIP Codes:

• Mail delivery ZIP Codes
• ZIP Code Tabulation Areas (ZCTAs) used for statistical purposes

Neither was originally designed to measure neighborhood conditions.

ZIP Codes often combine communities with very different populations, income levels, retail environments, and health outcomes into one large geographic area.

Mari Gallagher’s work instead relies on much smaller geographic units, such as Census Block Groups and individual blocks, to produce more precise, meaningful, and actionable findings.

This hyperlocal approach provides a much clearer understanding of community conditions.

In short: Grocery closures are almost always caused by multiple factors working together.

There is rarely one single explanation for why a grocery store closes.
Mari Gallagher’s research recognizes that closures may result from a combination of:

• Neighborhood market conditions
• Competition
• Crime and public safety concerns
• Infrastructure
• Rising operating costs
• Staffing challenges
• Corporate business strategies
• Changing consumer purchasing patterns
• Poor store management and operations

A closure should not automatically be interpreted as evidence that the surrounding community cannot support a quality grocery store.

Each location deserves an independent market assessment before conclusions are drawn.

In short: Healthy competition often strengthens grocery markets rather than weakening them.

Mari Gallagher challenges the common assumption that every competing grocery store harms existing retailers.

In many cases, quality grocers benefit from locating near other quality grocers because consumers are willing to travel farther to destinations that offer multiple shopping choices.

This creates:

• Increased customer traffic
• Stronger retail destinations
• Greater consumer convenience
• Improved market visibility
• Long-term investment confidence

This principle is closely connected to Retail Agglomeration, Like Attracts Like, and the MG Snowball Effect, all of which demonstrate how successful retailers often reinforce one another rather than compete in isolation.