.S.-Mexican relative prices and find that it is nearly an order of magnitude larger than for U.S.-Canadian prices. However, during a very … very slightly. We also present evidence that the border effect in U.S.-Mexican prices is not primarily due to the border … effect in U.S.-Mexican wages. Finally, using the prices of 276 highly dis-aggregated goods and services, we estimate the …

product menus and prices. When product menus are endogenous, however, tests for price discrimination may be biased by the fact … that unobservables affecting costs or demand may jointly determine product menus and prices leading one to falsely infer … attributes, product menus, and prices. …