In agricultural tenancy arrangements, the tenant is often required to
undertake effort aimed at maintaining and improving the productive sto
ck. This paper investigates the design of contracts which induce optim
al investment of such effort. It is found that a long-term contract wh
ich interlinks tenancy with a credit agreement is optimal. In equilibr
ium the tenant obtains credit from the landlord at a rate of interest
below the market, and is perpetually indebted to the landlord.