We report the discovery of a new factor for each of the Fermat numbers F13, F15, F16. These new factors have 27, 33 and 27 decimal digits respectively. Each factor was found by the elliptic curve method. After division by the new factors and previously known factors, the remaining cofactors are seen to be composite numbers with 2391, 9808 and 19694 decimal digits respectively.

This paper examines the impact of trade liberalization on U.S. Congressional elections. We nd that U.S. counties subject to greater competition from China via a change in U.S. trade policy exhibit relative increases in turnout, the share of votes cast for Democrats and the probability that the county is represented by a Democrat. We nd that these changes are consistent with Democrats in o ce du...

This paper discusses the measurement of production and employment effects of trade policy, and more broadly the effects of economic integration and globalization. First, it provides a broad-brush overview of the ex-post literature linking trade to performance, such as measures of worker displacement, adjustment costs, and econometric evidence on trade and wages. It then defines structural impac...

This paper infers the terms of trade effects of Free Trade Agreements (FTAs) implemented in the 1990s. We estimate large FTA effects on bilateral trade volume in 2 digit manufacturing goods from 1990-2002, using panel data gravity methods to resolve two way causality. The terms of trade changes implied by these volume effects are deduced for 40 countries plus a rest-of-the-world aggregate using...

States with weak institutions can lose from trade with strong states when trade is subject to predation. The happy liberal idea of trade fostering better institutions and peace can be turned on its head. The Ricardian model of trade subject to predation offered here implies imperialism without capital, contra Marxists. Weak and poor South trades with strong and rich North. Poor South labor is a...

Using monthly data on temporary trade barriers (TTBs), we estimate the dynamic employment effects of protectionism through vertical production linkages. First, exploiting high-frequency and TTB procedural details, identify policy shocks exogenous to economic fundamentals. We then use input-output tables construct measures affecting downstream producers. Finally, panel local projections using id...

Using an administrative data set containing daily information on individual workers’ employment histories, we investigate how workers’ labour market transitions are affected by international outsourcing. In order to do so, we estimate hazard rate models for match separations, as well as for worker flows from employment to another job, to unemployment, and to nonparticipation. Outsourcing is fou...

This paper discusses the occurrence of skill-enhancing technology import, namely the relationship between imports of embodied technology and widening skill-based employment di¤erentials in low and middle-income countries. GMM techniques are applied to an original panel dataset comprising 28 manufacturing sectors for 23 countries over a decade. Econometric results provide robust evidence of the ...