This paper provides a new theory for two-sided payment card markets. Adopting payment cards requires consumers and merchants to pay a fixed cost, but yields a lower marginal cost of making payments. Analyzing adoption and usage externalities among heterogeneous consumers and merchants, our...

This paper studies payment variation across locations and time using five years of transactions data from a large discount retail chain with hundreds of stores across the Fifth District. The results show that the median transaction size, demographics, education levels, and state fixed effects...

"Chinese exports have become increasingly sophisticated. This has generated anxiety in developed countries as competitive pressure may increasingly be felt outside labor-intensive industries. Using product-level data on exports from different cities within China, This paper investigates the...

In recent years, two important related developments have transformed the nature of world trade: the explosive growth of Chinese trade, and the growth of vertically specialized trade due to international production fragmentation. The literature in each of these two separate topics is large and...