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In most of the contract theory literature, contracting costs are assumed either to be high enough to preclude certain forms of contracting or low enough to permit any contract to be written. Similarly researchers usually treat renegotiation as either costless or prohibitively costly. This article addresses the middle ground between these extremes, in which the costs of contracting and renegotiation can take intermediate values and the contracting parties can themselves influence these costs. The context for our analysis is the canonical problem of inducing efficient relation-specific investment and efficient ex post trade. Among our principle results are: (i) The efficiency and complexity of the initial contract are decreasing in the cost to create a contract. Hence the best mechanism design contracts can be too costly to write. (ii) When parties use the simpler contract forms, they require renegotiation to capture ex post surplus and to create efficient investment incentives. In some cases, parties want low renegotiation costs. Most interesting is that, in other cases, parties have a strict preference for moderate renegotiation costs. (iii) The effect of contract law on contract form is significant but has been overlooked. In particular, the law's interpretive rules raise the cost of enforcing complex contracts, and thus induce parties to use simple contracts. Worse, the law also lowers renegotiation costs, which further undermines complex contracts and is also inappropriate for some of the simpler contracts.
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