Firms sometimes try to "poach" the customers of their competitors by offeri
ng them inducements to switch. We analyze duopoly poaching under both short
-term and longterm contracts assuming either that each consumer's brand pre
ferences are fixed over rime or that preferences are independent over time.
With fixed preferences, short-term contracts lead to poaching and socially
inefficient switching. The equilibrium with long-term contracts has less s
witching than when only short-term contracts are feasible, and it involves
the sale of both short-term and long-term contracts. With independent prefe
rences, short-term contracts are efficient, but long-term contracts lead to
inefficiently little switching.