This paper investigates the interaction between a firm's contracts fbr
labor and its contracts for credit under asymmetric information and l
imited liability, when workers are either always committed to their co
ntract or they lack the power to commit ex post because arbitrage oppo
rtunities are available to them. The analysis contains two main result
s: First, contrary to the perceptions of the limited liability literat
ure, where limited liability is thought of causing both underemploymen
t and income underinsurance, limited liability is in fact shown to onl
y cause underemployment. Existence of outside sources of credit elimin
ates the underinsurance side of the inefficiency, but can not eliminat
e underemployment. Second, the factor that does cause underinsurance i
s the existence of ex post arbitrage opportunities for the worker. Wor
ker mobility leads to underinsurance regardless of whether limited lia
bility is binding or not and even if outside sources of credit exist.
Thus, underemployment stems from limited liability, and underinsurance
stems from worker mobility.