Devin G. Pope and Jaren C. Pope have recently had a Working Paper published by NBER. It's #18111 (May 2012) and it's cleverly titled, "When Walmart Comes to Town: Always Low Housing Prices? Always?" Here's an ungated version. In it, they examine empirically the effect of arrival of new Walmart stores on the prices of houses within a small radius. Their idea is that such a measure will give the net effect of the benefits of having nearby Walmart and the other stores it attracts and the costs of congestion, traffic, etc.
Using a difference-in-differences specification, our estimates suggest that a new Walmart store actually increases housing prices by between 2 and 3 percent for houses located within 0.5 miles of the store and by 1 to 2 percent for houses located between 0.5 and 1 mile.
One other thing I found useful about the study is their terse review of the literature on other effects of Walmart. Here are the guts of the two main paragraphs on those other effects:
Phone surveys suggest that 84% of households in the U.S. shop at Walmart in a given year with 42% of households reporting to be regular Walmart shoppers (Pew Research Center, 2005). These surveys also show that lower-income households are more likely to shop at Walmart than upper-income households. In fact, Basker, (2005b), Hausman and Leibtag (2007), and Basker and Noel (2009) have shown that Walmart "Supercenters" that sell groceries offer many identical food items as other grocers at an average price that is substantially lower than their competitors. Hausman and Leibtag (2007) also find that these lower prices translate into a significant increase in consumer surplus.
Despite the consumer benefits from the expansion of supercenters into new geographic markets, there is often significant opposition and controversy when Walmart tries to open a new store. One concern of opponents is the impact that a new Walmart will have on local employment opportunities and wages. There is a small literature that has analyzed this common concern including Basker (2005a), Hicks (2007a) and Neumark et al. (2008). The findings of these studies have been mixed with Basker (2005a) and Hicks (2007a) finding positive effects on employment and/or wages, while Neumark et al. (2008) found negative effects.
I found the reference to Hausman and Leibtag intriguing. Following it up, I found this in a link provided by Mark Thoma:
The indirect effect of Wal-Mart occurs "even if you never enter a Wal-Mart," Hausman said, since supermarkets tend to drop their prices in competitive response to Wal-Mart's. In addition, Wal-Mart does not raise its prices after it has driven out the competition, he said.
"The indirect price effect is 5 percent even if you never go into a Wal-Mart," he said.
Hausman presented graphs to show that Wal-Mart's impact on consumers varies by income category: For families with incomes less than $10,000 annually, a super center makes a 30 percent difference in what they can buy. "The marginal utility on the poor is greater," he noted.
The rate of overall improvement in consumer welfare thanks to a Wal-Mart super center's direct and indirect effects on the cost of food in a community averages 3.75 percent, Hausman said.
"Getting a 3.75 percent improvement in consumer welfare is greater than any tax reform or other policies. And while Wal-Mart pays its employees less -- which does affect local wages -- you still can't beat that 3.75 percent. If economists could improve consumer welfare by that much, we'd all be heroes," Hausman said.
The last name "Pope" is not that common. I notice that one of the authors teaches at Brigham Young University, where another economist named Clayne L. Pope teaches. I remembered that name because Clayne Pope is a co-author of a famous study of the opinions of economists on various policy issues, a study that found that they tend to agree a lot on issues like rent control, tariffs, and minimum wages. In fact, I cited their study in my Introduction to The Concise Encyclopedia of Economics.
I also notice that there's an economist named Arden Pope at Brigham Young University. Assuming these are all sons of Clayne, I'm guessing he's a proud papa.