What is the impact of introducing a parallel OTC market? Theory and evidence from the chinese interbank FX market

Chinese interbank foreign exchange trading was originally conducted through a centralized, anonymous limit order book (LOB). We determine the impact of the introduction of a parallel decentralized over-the-counter (OTC) market. We find that: (1) most trading migrated to the OTC, (2) the LOB price function is upward-sloping versus the OTC price function is downward-sloping, and (3) the LOB market has a single price function versus the OTC market has multiple price functions. Next, we develop a theoretical model of parallel markets that can simultaneously explain all of these empirical findings. We test a new model prediction and find support.