Knowledge that Transforms

A multi-sector buffer-stock inventory model is developed in an attempt to resolve the problem of aggregation involved in deriving implications for the stability of the economy from a consideration of inventory practices of individual firms. It is demonstrated that stability depends upon a multitude of parameters, some of which are suppressed in aggregative model construction. The economy is necessarily unstable when perfect, if myopic expectations are assumed. With naive expectations stability becomes a definite possibility, particularly if firms attempt only a delayed adjustment of inventories to the equilibrium level. Although the empirical evidence marshaled in order to illustrate the application of the theorems does not prove sufficiently accurate to permit precise conclusions, it is apparent that the conditions for stability may well be satisfied for reasonable values of the system's parameters. Tax schemes which have been suggested as means of stabilizing fluctuations in inventory investment are appraised in the concluding section.

In this article we derive the exact finite sample frequency functions of the least squares and maximum likelihood estimators of the marginal propensity to consume, assuming the basic stochastic Keynesian model. The properties of these functions are considered in more detail for particular values of the parameters and sizes of sample. It is concluded that, for samples of 10 or more observations, generated by the model considered (with realistic values of the parameters), the maximum likelihood estimator of the marginal propensity to consume is the better general purpose estimator of this parameter. ALTHOUGH THERE have been several major contributions to the large sample theory of estimators of the parameters of simultaneous equation systems,' there is, as yet, virtually no small sample theory for these estimators. With the exception of Nagar's approximations for the bias and moment matrix of k-class estimators,2 evidence concerning the small sample behaviour of various estimators is confined to two types. The first type includes studies in which the parameters of simultaneous equation models have been estimated, by various methods, from real data, so that the resulting estimates can be compared, by either referring to economic theory and other a priori evidence, or testing predictions.3 The value of such studies is limited, however, by unknown errors in both the data and the specification of the models. The second type of evidence is provided by a number of valuable Monte Carlo studies.4 But these too have certain disadvantages as compared with a mathematical study. One is that, in order to investigate the effects of variations in the sample size or the structural parameters, it would be necessary to analyse many different sets of synthetic samples. Another is that the measures obtained from Monte Carlo studies are, themselves, subject to sampling errors. Moreover, in studies based upon no more than 100 synthetic samples, these errors are not negligible.5

In this paper a game theoretic model will be developed for the determination of acreage allocation among four crops-wheat, corn, oats, and soybeans. The model will be functionally dependent upon statistical demand elasticity curves and will be applied to data for the period 1948-1958 for the United States. Elements of an individual farmer's strategy will be presented. In addition, the optimal game theoretic acreage allocation for the above period for total United States production will be compared with the actual acreage allocation for the four crops. The discussion throws light on the reasons for some of the variations in annual acreage for the above crops. A GAME theoretic model will be developed for an agricultural crop selection problem. The effect of competitive marketing aspects will be indicated in the allocation of cropland among four commodities. By reducing the problem to a two-person game between an individual farmer and a hypothetical combination of all the forces that determine market prices, the importance of the individual withholding crop intentions information from the group as part of his optimal strategy will be indicated. The optimal allocation of total acreage for the United States will be given from the game theory viewpoint. This will be compared with the actual allocation of the four crops: wheat, corn, oats, and soybeans for the period 1948-1958 in the United States. Good correlation will be shown between the actual allocation of corn acreage and the game theoretic optimal allocation. For oats, good correlation will be shown between the actual allocation for the current year and the game theoretic optimal allocation for the previous crop year. Poor correlation will be shown for wheat and soybeans. An attempt will be made to explain these correlation results.