Consider a labour market with unemployment and no vacancies where output is non-verifiable. What labour-contract do you expect?

a)A piece rate contract, where firms pay their workers ex-post for their output

b)Fixed wage contract, where firms pay ex-ante and can fire the worker ex-post if he did not produce

c)An explicit contract that specifies how much production the worker has to provide

d)A wage contract that yields the firm the full surplus of the relation