Abstract
The concept of fishing effort is central to fisheries economics and management. However, effort is an aggregate index of inputs which can be consistently formed only under the condition on production technology of homothetic separability of inputs. This paper develops the conditions under which effort can be consistently formed. It then provides the first empirical test for effort and jointness in inputs in a fishery by estimating a multiproduct function for the New England otter trawl fleet. After not rejecting input-output separability and rejecting nonjointness in inputs, the construction of a superlative index for effort is demonstrated through estimating a translog production function. The implications of effort's internal structure for fisheries management are then considered.
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