DEVELOPMENT ECONOMICS as a separate branch of economics emerged at the end of the Second World War. During the dominance of neo-classical economics from the 1870s until the Keynesian Revolution of the 1930s, economists were more concerned with partial equilibrium analysis. They worked on the assumption that a free competitive capitalist economy would automatically ensure the maximisation of nat...

Qualitative reasoning about physical systems has become one of the most active and productive areas in AI in recent years. While there are many different kinds of qualitative reasoning, the central role is played by qualitative simulation: prediction of the possible behaviors consistent with incomplete knowledge of the structure of physical system. In the retrospective on my 1984 paper, “Common...

We study the phenomenon of accidental or “emergent” supersymmetry within gauge theory and connect it to the scenarios of Split Supersymmetry and Higgs compositeness. Combining these elements leads to a significant refinement and extension of the proposal of Partial Supersymmetry, in which supersymmetry is broken at very high energies but with a remnant surviving to the weak scale. The Hierarchy...