Combined simulation-optimization models have been widely used to address the management of water resources issues. This paper presents a simulation-optimization model for conjunctive use of surface water and groundwater at a basin-wide scale, the Zayandehrood river basin in west central Iran. In...

Water resources management in semiarid regions with low precipitation and high potential of evapotranspiration is a great challenge for managers and decision makers. In those regions, both sources of water should be managed conjunctively so as to minimize shortages of water in dry seasons. In...

Reservoir operation cannot be carried out without due heed to surface water and groundwater resources, since neglecting either will have irreversible consequences. Optimal operation of the Zayandehrood Dam which supplies water into the Zayandehrood River basin in the central plateau of Iran is a...

We account for the sources of world productivity growth, using data for more than 36 industries and 40 major economies from 1996 to 2014, explicitly taking into account changes in the misallocation of resources in labor, capital, and product markets. Productivity growth in advanced economies...

I document that (i) the mean and dispersion of pre-tax labor earnings grow faster over the life-cycle in the U.S. than in some European countries; (ii) these facts are largely driven by individuals with at least a college degree. I study these differences in labor earnings inequality using a...

I document that for a group of 38 countries ranging from low to high income: (1) the share of skilled managers is higher in richer countries, (2) the relative income of managers to non-managers is lower in richer countries, and (3) the relative income of skilled to unskilled individuals is lower...