Chakravorti and Emmons model side payments in a competitive creditâcard market. If competitive retailers absorb the cost of accepting credit cards by charging a higher goods price to everyone, then someone must subsidize convenience users of credit cards to prevent them from defecting to merchants who do not accept cards...
The proportion of retail, non-cash payments made electronically in the U.S. grew from 15% in 1979 to 40% in 2000. A recent Chicago Fed conference addressed the important question of whether today's payment networks can adequately support emerging payment technologies.