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The paper analyzes conditions for implementing incentive schemes based on, respectively joint, relative and indendent performance, in a relational contract between a principal and a team of two agents. A main result is that the optimal incentive regime depends on the productivity of the agents, or more preciseley on the returns from high effort. This occurs because agents' productivites affect the principal's temptation to renege on the relational contract. The analysis suggests that we will see a higher frequency of relative performance evaluation (RPE) -and schemes that lie close to independent performance evaluationas we move from low-productive to high-productive environments. In particular, it is shown that if effort-productivity is sufficently high, the optimal scheme for the principal is (for a range of discount factors) a collusion-proof RPE scheme, even if there is no common shock that affects the agents' output.

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In several food-producing sectors, we observe vertical integration between the farming and processing stages. The salmon industry, which has motivated this paper, has seen a rise in large vertically integrated companies over the last decade, with direct ownership of production activities including hatcheries, fish processing and exporting. Both the farming and processing stages have become more capital intensive, which has led to a steeper U-shaped average cost (AC) curve. In this paper we present a theoretical link between this technological shift and vertical integration: in a repeated game model of relational contracting, we show that when the AC curve is sufficiently steep, then processors and farmers are more likely to vertically integrate. The reason is that steep AC curves make it costly to deviate from the optimal production scale, which in turn makes processors more vulnerable to hold-up and opportunistic behaviours from its suppliers. Copyright (c) 2008 The Authors. Journal compilation (c) 2008 The Agricultural Economics Society.

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