Localized externalities,contagious processes and the deterioration of urban housing: An empirical analysis

Housing deterioration can develop in spatial-temporal patterns which are compatible with the operation of localized externalities if deteriorated structures exert negative effects on the condition of nearby structures or if structures are affected by unfavorable conditions which are endemic to entire neighborhoods. The pattern of housing deterioration in space and time is examined, using a time series of housing condemnations for Indianapolis. A non-linear logit model with a spatial-temporal lag structure is used to analyze the association between the occurence of new condemnations and the location of existing condemned structures. The model predicts the probability that a housing condemnation occurs within a given time period as a function of the numbers of condemned structures in the same area and adjoining areas at the beginning of the time period. The size of the areas is flexible and an appropriate scale for the process is identified by varying the size of the areas.     

A probability inequality for ranges and its application to maximum range test procedures

Summary It is proved that for any fixed argument the sequence (P _k) of the distribution functions of the ranges ofk i.i.d. univariate random variables is log-concave if the random variables have a log-concave density. If the support of the distribution is an infinite interval and the density is monotonous then the theorem holds also with “log-convex” instead of “log-concave”. The resulting inequalities can be used by a quick algorithm for closed maximum range test procedures for all pairwise comparisons (Royen 1988, 1989a, 1989b). Under the above assumptions the application of this algorithm can be extended e.g. to pairwise comparisons of variances.     

The economics of decision making in the new manufacturing firm

Decision making in a modern manufacturing firm producing a variety of products while meeting order deadlines appears at first to have little basis in the economic Theory of the Firm. It is shown that optimal budget allocations, the fractions of revenue expended on inputs, are likely to remain constant for a succession of orders for each of a family of products, thus simplifying the decision process. Well-known heuristic decision rules may not only have a sound basis in economic theory but are evidently the best way to incorporate economic logic into a stream of fast-moving decisions. The discussion is extended to an explanation of the economic value of decision making to the firm, and why this value is usually assumed to be zero in theory.     

Aggregation effects on price and expenditure elasticities in a quadratic almost ideal demand system

Abstract.  While it is well known that demand elasticities calculated at the macro level will in general differ from those calculated at the micro level because of aggregation effects, there remain the questions of how large the effects are and how they vary with the degree of inequality in the income distribution. We explore these questions with models based on a quadratic version of the Almost Ideal Demand System. We investigate the elasticity differences theoretically and then calibrate the models and generate numerical results, using income data for seven countries with widely different distributions. The aggregation effects are found generally to be rather small, even with highly unequal income distributions.     

A reconciliation of recent results in optimal taxation theory

The recent papers by Guesnerie and Diewert on tax reforms are interpreted as contributions to the characterization of second-best optima. This paper demonstrates that when it is possible to achieve any feasible direction of change in supplies by a differential change in producer prices, there are unique producer support prices. Under these circumstances, the apparent differences between Guesnerie and Diewert are reconciled. Optimality conditions with nonunique support prices are also considered.     

Dynamic effects of externalities,optimal saving and economic growth

Conclusion Recognizing the fact that provision of mixed public goods can result in both consumption externalities of the Samuelsonian variety as well as production externalities we set out to extend the earlier results of Rao and Kalpagam (1977) on the effect of public goods on economic growth. In so doing, we considered three standard specifications of production externalities and enlarged the concept of consumption displacement. Our basic conclusion is that the results of our earlier paper remain valid under the more general conditions set out in this paper.