in knowledge spillovers. Drawing on the NBER Patent Citations Database, we examine patent citations data at metropolitan … of cited patent, which implies that new knowledge faces the largest barriers to diffusion. However, over time, border and … sources of overestimated aggregate border effects of knowledge spillovers. While self-citations are only 11% of total …

World trade evolves at two margins. Where a bilateral trading relationship already exists it may increase through time … have not traded with each other in the past (extensive margin). We provide an empirical dissection of post-World-War- II … growth in manufacturing world trade along these two margins. We propose a "cornersolutions- version"of the gravity model to …

economies and the rest of the world. Through a variance decomposition and counterfactuals, the model allows us to assess the …

We construct the world's centers of gravity for human population, GDP and CO2 emissions by taking the best out of five …th century, after World War I for CO2 emissions, after World War II for GDP. Since then, both centers are moving eastward …

with the World Bank’s Global Bilateral Migration Database. Overall, our results suggest little evidence that natural …