Product selection and costs in a partially unionized industry

This paper examines differences in costs among union and nonunion firms operating in the multiple and competitive lumber markets; develops a model of output and product selection decisions; and then estimates the cost function implied by the model for a sample of sawmills that produce green and dry lumber. Overall, the average variable costs for the green technology are about 67 percent higher for union mills and, for the dry technology, costs are about 30 percent higher. However, differences inminimum average variable costs are negligible in the dry market but are significant in the green market. The results suggest that some union mills may be able to coexist with nonunion mills in a competitive industry by specializing in market niches determined by comparative cost advantages. The authors gratefully acknowledge comments from James Bennett, Jo Anna Gray, Chris Ellis, Stephen Haynes, Joe Kerkvliet, and an anonymous referee.     

Brazilians in Portugal,Portuguese in Brazil: Constructions of sameness and Difference 1

In this essay, I seek to understand the contradictions, ambiguities, and accommodations underlying the remodeling of Portugal from an imperial metropolis to an European postcolonial nation. From this perspective, I examine the reconfigurations of sameness and difference between Portugal and Brazil, in the present conjuncture of global capitalism, in two acts. The first discloses a historical conjuncture of intense ideological disputes on “what the Portuguese nation should be” and, the second indicates that the present configuration of Portuguese nationalism increasingly intersects with the politics of investments and the marketing of Portuguese high culture. Both acts bring to the fore the reconfigurations of the Portuguese empire and of the Portuguese “imperial mentality” in this present juncture of global capitalism.     

ON THE ANALYSIS AND APPLICATION OF MEASURES OF LINKAGE DISEQUILIBRIUM

The maximum likelihood, jackknife and bootstrap estimators of linkage disequilibrium, a measure of association in population genetics, are derived and compared. It is found that for point estimation, the resampling methods generate almost identical mean square errors. The maximum likelihood estimator could have bigger or smaller mean square errors depending on the parameters of the underlying population. However the bootstrap confidence interval is superior to the other two as the length of the intervals is shorter or the probability that the 95% confidence intervals include the true parameter is closer to 0.95. Although the standardised measure of linkage disequilibrium has a range from -1 to 1 regardless of marginal frequencies, it is shown that the distribution of this standardised measure is still not allele frequency independent under the multinomial sampling scheme.     

Evaluating economic theories of NPOs: A survey, a case study and some new directions for socio-economics

The contribution economists have made to the multidisciplinary field of non-profit studies is remarkable when one considers that non-profit organizations (NPOs) have traditionally been regarded as “non-economic” institutions that lie outside the scope of economic analysis. However, despite its achievements there has been concern about the emergence of “theoretical inertia” in the economics of NPOs. This paper suggests some ways in which the revisionist approach reflected in economic theories of the supply-side of the voluntary sector could be augmented. In particular it focuses on the emotional basis for stakeholder commitments and the consequent dependence NPOs have on their organizational leadership to foster the development of shared hopes that can sustain these commitments in the face of disappointments. These ideas are discussed in relation to the provision by NPOs of supported employment services to the disabled.     

Robust kernel estimators for additive models with dependent observations

Robust nonparametric estimators for additive regression or autoregression models under an α-mixing condition are proposed. They are based on local M-estimators or local medians with kernel weights, and their asymptotic behaviour is studied. Moreover, diese local M-estimators achieve the same univariate rate of convergence as their linear relatives.     

Response to Ermisch, Martin, and Wu

Our recent paper in Demography (Gray, Stockard, and Stone 2006) has attracted the close scrutiny of several prominent academics. Three sets of formal comments, authored independently by Ermisch, Martin, and Wu (EMW), appear in this issue of Demography. In this response we argue that the analysis and evidence of our 2006 paper have withstood the scrutiny of EMW. In particular, we find that a substantial part of the rising share of nonmarital births since 1970 is due to a selection effect associated with marriage. This same selection effect also explains how birth rates could rise in both groups, even though their combined birth rate did not. In sum, though we appreciate the opportunity to expand on several key aspects of our 2006 article, we see no reason to substantially revise any of our major conclusions based on the EMW comments.