Oh how WalMart is underrated:
In this paper we estimate consumer benefits from supercenter entry and expansion into markets for food. We estimate a discrete choice model for household shopping choice of supercenters and traditional outlets for food. We have panel data for households so we can follow their shopping patterns over time and allow for a fixed effect in their shopping behavior. Most households shop at both supercenters and traditional outlets during the period. Given a model of shopping behavior we estimate the compensating variation of household from the presence of supercenters. We find the benefits to be substantial. Thus, while we do not estimate the costs to workers who may receive lower wages and benefits, we find the effects of supercenter entry and expansion to be sufficiently large so that overall we find it to be extremely unlikely that the expansion of supercenters does not confer a significant overall benefit to consumers...
Wal-Mart offers many identical food items at an average price about 15%-25% lower than traditional supermarkets...
We estimate the average effect of the total the compensating variation to be 25% of food expenditure, a sizeable estimate...
Since we find that lower income households tend to shop more at these low priced outlets and their compensating variation is higher from supercenters than higher income households, a significant decrease in consumer surplus arises from zoning regulations and pressure group tactics that restrict the entry and expansion of supercenters into
particular geographic markets.
From MIT's economics department of Agriculture
