An Economic Case against Vouchers: Why Local Public Schools Are a Local Public Good

Statewide voucher plans are consistently rejected in plebiscites. This article explains voters' attachment to public education despite the schools' deficiencies: The public benefit of local schools accrues to parents, not children. Having children in a local school enables adults to get to know other adults better, which in turn reduces the transaction costs of citizen provision of true local public goods. This network of adult acquaintances within the municipality is "community-specific social capital." Vouchers would disperse students from their communities and thereby reduce the communal capital of residents. Voters' implicit understanding of this causes them to reject large-scale voucher plans.

Line strength variations in beta Cephei

The line strength variations of the resonance line of C IV (1550A, 2s 2S - 2P) observed by OAO-2 were confirmed by IUE observations. In addition, the NV resonance line (1204A, 2s 2S - 2P), the Si III line (1206A, 3p 1P-1D, multiplet 11) and the Si IV resonance line (1395A, 3s 2S - 2P) all vary in line strength essentially in phase with the C IV variation. The (preliminary) period of the variation is 6.02/12.04 days

Relevance-TCAV: Explaining Deep Neural Nets in Human Concepts

Neural Networks, a form of machine learning, are used in increasingly important roles in the modern world. They are being used in self-driving cars and medical diagnoses. However, they are “Black Boxes”: they cannot be easily interpreted by humans. This project combines two methods of explaining a neural network’s decisions in an attempt to improve their accuracy. This new method, relevance-based testing with concept activation vectors (R-TCAV), yields promising results on two small experiments but is less precise than the previous TCAV method

Why Judicial Reversal of Apartheid Made a Difference

Did Buchanan v. Warley\u27 have any practical effect on the economic well-being of black Americans? Michael Klarman argues that it did not, since the enforcement of racial segregation proceeded along other lines, such as regular zoning, racial covenants, informal discrimination, and unofficial violence. David Bernstein disagrees in part with Kiarman\u27s conclusion. He argues that Buchanan v. Warley effectively made more housing available to blacks in urban areas, even if it did not promote racial integration. I second Bernstein\u27s conclusion by putting Buchanan in the context of the urban-economics theory of housing segregation. Because Buchanan helped blacks gain a foothold, albeit a segregated one, in central cities, it was instrumental in facilitating the Great Migration of blacks from the rural South to urban areas in the North. Had Buchanan v. Warley been decided the other way, the American civil rights movement might have played out differently. Without housing in central city areas of the North, blacks would have been less able to generate political support for the federal civil rights legislation of the 1960s. As KIarman has argued elsewhere, the creation of a northern black urban community greatly facilitated this legislation. Without the urban concentration of blacks facilitated by Buchanan v. Warley, the civil rights movement could have been delayed or have found other channels. I use the term apartheid to describe the system at issue in Buchanan instead of segregation because apartheid carries specific connotations of legally enforced residential segregation. Racial segregation exists in American cities, but it is not officially compelled by the law of the land. The law of the land for a long time tolerated and enforced private covenants that had racial exclusion as their objective. And law enforcement officers often looked the other way when private violence excluded blacks from white areas. However, one needs to make a hostile stretch of the English language to characterize the American pattern of segregation since Buchanan v. Warley as apartheid