"Factor Adjustments after Deregulation: Panel Evidence from Colombian Plants," (with Marcela Eslava, John Haltiwanger and Maurice Kugler), Review of Economics and Statistics, May 2010, 92(2). "Employment and Social Security: An Alternative View," in Bjorn Lomborg, ed., Latin American Development Priorities: Costs and Benefits, Cambridge University Press, 2010. "Market Reforms, Factor Reallocation, and Productivity Growth in Latin America," (with Marcela Eslava, John Haltiwanger, and Maurice Kugler), in Norman Loayza and Luis Serven, eds.