In the 1990s and 2000s Wal-Mart entered the grocery sector in several U.S. cities and as a result it brought lower prices on food. That the Bureau of Labor Statistics did not send its shoppers into these new stores in a timely fashion led to the CPI

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The Bureau of Labor Statistics not sending its shoppers into the new Wal-Mart stores in a timely fashion meant they missed capturing the lower prices available there. This oversight led to the CPI overstating inflation because it did not account for the lower prices at locations where people were increasingly shopping, hence missing "where people shop".

In the 1990s and 2000s Wal-Mart Entered the Grocery Sector