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Abstract
This paper proposes modifications to the existing EU set-aside policy which are designed to
alleviate the problem of output slippage associated with heterogeneous land quality by using
"incentive-compatible" mechanisms drawn from principal-agent theory. Specifically, it is
suggested that there should be differential reference yields based on land quality to
discourage the "adverse selection" of lower quality land for set-aside, and that the scope of
set-aside monitoring should be expanded to include both the quantity and the quality of land
set-aside so as to discourage "moral hazard" problems. The potential of these modifications
is illustrated using a numerical analysis, which is also used to evaluate the role of a range of
factors which determine the set-aside decision. Finally, an estimate of the "benefits" from
reducing slippage required to justify the costs of including these modifications is provided.