I show that cotton price shocks predict lynchings of African Americans in the US South from 1882 to 1930. Specifically, a standard deviation decrease in the cotton price leads to a 0.095 to 0.16 standard deviation increase in lynchings, within a cotton-producing county. Lynchings also predict more black out-migration from 1920 to 1930. Using a simple model, I show that this is consistent with l...

One theory argues that state ownership of infrastructure is greater in poor countries because the social returns from investment exceed the private returns by a wider margin. Another theory argues that state ownership is greater when legal and political institutions provide weak enforcement of private property rights or weak limits on government excess. I test these theories using cross-country...

Using modeling and simulation users can apply realistic interactions with their synthetic environments representing real world. In this study the synthetic environment is a hardware railroad model representing a miniature replica of a full-size railroad system under study. The hardware model is tested by means of real-time adaptive software simulator consisting of two subsystems: the virtual ra...

Two connections between fullerene structures and alternating knots are established. Knots may appear in two ways: from zigzags, i.e., circuits (possibly self-intersecting) of edges running alternately left and right at successive vertices, and from railroads, i.e., circuits (possibly self-intersecting) of edge-sharing hexagonal faces, such that the shared edges occur in opposite pairs. A z-knot...

Using modeling and simulation users can apply realistic interactions with their synthetic environments representing real world. In this study the synthetic environment is a hardware railroad model representing a miniature replica of a full-size railroad system under study. The hardware model is tested by means of real-time adaptive software simulator consisting of two subsystems: the virtual ra...