Taking the price situation as given in roduct and factor markets, a capital accumulation, and gross input for United Kingdom agriculture is derived by incor orating internal adjustment cost and estimated using a discrete approximation. The results are consistent with eficient use of resources, but further incentives for capital investment and a greater exodus of labour could upset this. Adjustment costs as estimated account for 2.6per cent of the vaLue of output; those associated with net investment for 1.8 per cent, and those associated with employment and gross input for 0.57 and 0.23 per cent respectively. non-linear differential equation mode P of gross output, employment, functions into the representative i ecision-maker's objective function, * This paper has benefited from discussions I had with J. McIntosh. from the University of Essex. and especially with G. T. Jones, from the University of Oxford, who also read an earlier draft and made some useful comments. An earlier version of this pa er was presented at the Agricultural Economics Society Annual Conference, 1985, and fwould like to thank the participants for their useful comments. Thanks are also due to the anonymous referees for their useful comments. t Institute of Agricultural Economics, University of Oxford, Dartington House, Little Clarendon Street. Oxford 0x1 2HP.