NATIONAL BUREAU OF ECONOMIC RESEARCH

# Geert Ridder

Department of Economics
University of Southern California
Kaprielian Hall
Los Angeles, CA 90089
Tel: 213/740-3511
Fax: 213/740-8543

E-Mail:
Institutional Affiliation: University of Southern California

## NBER Working Papers and Publications

 March 2016 Identification and Efficiency Bounds for the Average Match Function under Conditionally Exogenous Matching with Bryan S. Graham, Guido W. Imbens: w22098 Consider two heterogenous populations of agents who, when matched, jointly produce an output, Y. For example, teachers and classrooms of students together produce achievement, parents raise children, whose life outcomes vary in adulthood, assembly plant managers and workers produce a certain number of cars per month, and lieutenants and their platoons vary in unit effectiveness. Let W\in\mathbb{W}={ w_1,\ldots,w_j} and X\in\mathbb{X}={ x_1,\ldots,x_k} denote agent types in the two populations. Consider the following matching mechanism: take a random draw from the W=w_j subgroup of the first population and match her with an independent random draw fro... October 2010 Measuring the Effects of Segregation in the Presence of Social Spillovers: A Nonparametric Approach with Bryan S. Graham, Guido W. Imbens: w16499 In this paper we nonparametrically analyze the effects of reallocating individuals across social groups in the presence of social spillovers. Individuals are either 'high' or 'low' types. Own outcomes may vary with the fraction of high types in one's social group. We characterize the average outcome and inequality effects of small increases in segregation by type. We also provide a measure of average spillover strength. We generalize the setup used by Benabou (1996) and others to study sorting in the presence of social spillovers by incorporating unobserved individual- and group-level heterogeneity. We relate our reallocation estimands to this theory. For each estimand we provide conditions for nonparametric identification, propose estimators, and characterize their large sample properties... April 2009 Complementarity and Aggregate Implications of Assortative Matching: A Nonparametric Analysis with Bryan S. Graham, Guido W. Imbens: w14860 This paper presents methods for evaluating the effects of reallocating an indivisible input across production units, taking into account resource constraints by keeping the marginal distribution of the input fixed. When the production technology is nonseparable, such reallocations, although leaving the marginal distribution of the reallocated input unchanged by construction, may nonetheless alter average output. Examples include reallocations of teachers across classrooms composed of students of varying mean ability. We focus on the effects of reallocating one input, while holding the assignment of another, potentially complementary, input fixed. We introduce a class of such reallocations -- correlated matching rules -- that includes the status quo allocation, a random allocation, and bot...Published: Bryan S. Graham & Guido W. Imbens & Geert Ridder, 2014. "Complementarity and aggregate implications of assortative matching: A nonparametric analysis," Quantitative Economics, Econometric Society, vol. 5, pages 29-66, 03. citation courtesy of

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