We develop a property-rights model of the firm in which production entails a continuum of uniquely sequenced stages. In each stage, a final-good producer contracts with a distinct supplier for the procurement of a customized stage-specific component. Our model yields a sharp characterization for the optimal allocation of ownership rights along the value chain. We show that the incentive to integrate suppliers varies systematically with the relative position (upstream versus downstream) at which the supplier enters the production line. Furthermore, the nature of the relationship between integration and "downstreamness" depends crucially on the elasticity of demand faced by the final-good producer. Our model readily accommodates various sources of asymmetry across final-good producers and across suppliers within a production line, and we show how it can be taken to the data with international trade statistics. Combining data from the U.S. Census Bureau's Related Party Trade database and estimates of U.S. import demand elasticities from Broda and Weinstein (2006), we find empirical evidence broadly supportive of our key predictions. In the process, we develop two novel measures of the average position of an industry in the value chain, which we construct using U.S. Input-Output Tables.

We propose two distinct approaches to the measurement of industry upstreamness (or average distance from final use) and show that they yield an equivalent measure. Furthermore, we provide two additional interpretations of this measure, one of them related to the concept of forward linkages in Input-Output analysis. On the empirical side, we construct this measure for 426 industries using the 2002 US Input-Output Tables. We also verify the stability of upstreamness across countries in the OECD STAN database, albeit with a more aggregated industry classification. Finally, we present an application that explores the determinants of the average upstreamness of exports at the country level using trade flows for 2002.

We study the collapse of international trade flows during the global financial crisis using detailed data on monthly US imports. We show that credit conditions were an important channel through which the crisis affected trade volumes, by exploiting the variation in the cost of capital across countries and over time, as well as the variation in financial vulnerability across sectors. Countries with higher interbank rates and thus tighter credit markets exported less to the US during the peak of the crisis. This effect was especially pronounced in sectors that require extensive external financing, have limited access to trade credit, or have few collateralizable assets. Exports of financially vulnerable industries were thus more sensitive to the cost of external capital than exports of less vulnerable industries, and this sensitivity rose during the financial crisis. The quantitative implications of our estimates for trade volumes highlight the large real effects of financial crises and the potential gains from policy intervention.

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What underlying long-term conditions set the stage for the Arab Spring? In recent decades, the Arab region has been characterized by an expansion in schooling coupled with weak labor market conditions. This pattern is especially pronounced in those countries that saw significant upheaval during the first year of the Arab Spring uprisings. We argue that the lack of adequate economic opportunities for an increasingly educated populace can help us understand episodes of regime instability such as the Arab Spring.