An example of multiple minima in a Cochrane-Orcutt procedure with multiple autocorrelation

We provide an example, based on an equation of the Canadian-US exchange rate, of multiple minima in a generalized Cochrane-Orcutt procedure. Our experiments suggest the need for search procedures in order to correctly identify autocorrelation structures.     

Options in income support for the aged: A critique of the two-tier approach

Support for the two-tier approach to income maintenance for the aged is becoming widespread. Two-tier formulas combine an income-conditioned bottom tier with an earnings-related top tier to achieve antipoverty and earnings replacement objectives. This paper first refutes the claim that the two-tier approach is generally more target-efficient in reaching the poor than is the earnings-related top tier with progressive replacement rates. Next, the paper compares the effectiveness of the two systems in terms of other goals. The paper concludes by showing that a top tier with a low tax on current income can virtually dominate a wide range of two-tier formulas.     

Improving fuel utilization in steel mill operations using linear programming

This paper describes the use of linear programming to improve the fuel utilisation at a major Midwestern steel mill. In particular, linear programming is used to determine an efficient fuel allocation plan for this steel mill, which reduces the total fuel costs for the steel mill operations. The efficient fuel allocation plan that is developed utilises two externally purchased fuels: natural gas and fuel oil, and two gases: blast furnace gas and coke plant gas, which are internally generated as natural by-products of the production process. Test results from the application of the linear programming model are presented and discussed, and indicate that considerable cost savings can be achieved by utilizing a fuel allocation plan which more effectively utilizes the by-product gases which are produced within the steel making process.     

Testing hypotheses of ghetto morphology

Socioeconomic urban policy has generally treated the American black ghetto as a single community or neighborhood. A study of recent literature suggests that the socioeconomic structure of ghetto space may be developing a spatially systematic heterogeneity. The literature has suggested several hypotheses concerning the socioeconomic morphology of ghetto space, but heretofore these hypotheses have not been tested in any rigorous fashion. This is the objective of this study. The results of these tests suggest that the ghetto is indeed developing as a socioeconomically heterogeneous subsystem spatially parallel to the overall urban system. This implies that a multiplicity of communities or neighborhoods are developing over time. In order to be effective, the processes of urban planning and policy development must address this evolving pattern.     

Monopsonistically/monopolistically competitive regional development: Public correction of market outcomes

A model of regional market development is constructed which captures the inefficiencies typical in most of the related literature, and a variety of corrective policy options are explored. For taxes and subsidies, there is no dominant policy with each limited by the zero-profit constraint on entry, informational problems, or adverse distributional considerations. Discriminatory pricing decreases efficiency, but uniform pricing achieves optimal allocations. Public production has certain informational advantages.