The general negleet of economic considerations in response researeh is noted. Following the listing of several factors which influence investment in response research, a framework is developed in whieh knowledge of a process is viewed in terms of the expected value and variance of profits. A Bayesian scheme for incorporating additional information in posterior analysis is outlined. Worth of additional information is judged in terms of utility. The seheme is used to show how the value of obtaining additional information can be aseertained ex ante in preposterior analysis by way of a Monte-Carlo approach. Both posterior and preposterior analyses ate illustrated through a soybeanJertilizer process. In this empirical example, the effects of using different experimental designs of varying size ale examined. F OR A decade or more, agricultural economists (production variety) have been urging agricultural scientists to estimate crop and livestock production functions. Such estimates, we have argued, will enable farmers to make better decisions on input and output levels in their crop and livestock production. At the same time, no overt attention has been given to the economics of conducting such research. No concrete guidance has been given as to the extent to which response processes might best be investigated in terms of costs and returns.Seemingly ah act of professional faith, our evangelizing has implied that production function estimation based on experiments with "many factors at many levels rather than many replications of a few factors" will give information of greater value than its cost. Or else, in chasing the MVP of the ith factor, we have ignored the MVP of response research itself. It is as ir the mere organization of data in a form aesthetically suited to applying production economics principles has been an end in itself. Either of these implications leaves much to be desired. Here we hope to make a start towards rectifying this situation by providing some appreciation of the economics of response research.To make the problem tractable, we confine our attention to the situation of a farmer interested in investing in his own response research. Thus, by taking the problem out of the public arena, we avoid the peripheral complications of, on the cost side, having to consider fiscal policies for the financing of public research, and interrelatedly, on the revenue side, having to assess the aggregate social benefits of public response research. Not that these macro problems are unimportant, but they can hardly be appraised without first having ah appreciation of response research in its micro aspects.* With the usual caveat, we are indebted to John Phillips for critical comments.J. R. ASDERSOI~ AND ffOItN L. DIIa~s ate, respectively, research feUow and profe, sor in the