The effect of consumer switching costs on prices: A theory and its application to the bank deposit market

As demonstrated by Klemperer (1987), if households face a cost of switching among brands of a differentiated good, pricing is likely to be more competitive, the greater is the fraction of customers that move into or around the market. I generalize this theory to a world with arbitrary market structure and test it empirically using panel data on bank retail deposit interest rates. I find that the amount of household migration in a market has a significant competitive influence on price markups, that is, a positive effect on the level of deposit interest rates. Consistent with the model, the magnitude of this effect depends in some cases upon the degree of market concentration.