Efficiency in one-sector,discrete-time,infinite-horizon models

In recent years, a considerable number of papers have been devoted to the problem of characterizing efficient programs in infinite-horizon models. In the present paper on one-sector models, it is shown that (1) the study of production or consumption efficiency can be reduced to the study of a single model, and (2) certain measures of curvature are crucial for the efficiency of programs. Criteria for efficiency of programs using these curvature measures are given and it is indicated how the existing results in the field can be obtained using the present criteria.