We study the effect of increases in state minimum wages on the prices of several fast-food items using quarterly city-level data from 1993-2012, a period during much of which the federal minimum wage declined in real value while state-level legislation flourished. For two products, burgers and...

Barcode scanners, introduced in the early 1970s, were a foundational process innovation in the grocery supply chain. By 1984 scanners had been installed in 10% of food stores in the U.S. Difference-in-difference analysis of city-level price data shows that scanners reduced prices of groceries by...