223 [ Journal of Labor Economics, 2008, vol. 26, no. 2]  2008 by The University of Chicago. All rights reserved. 0734-306X/2008/2602-0001$10.00 Cues for Timing and Coordination: Latitude, Letterman, and Longitude Daniel S. Hamermesh, University of Texas at Austin, National Bureau of Economic Research, and IZA Caitlin Knowles Myers, Middlebury College and IZA Mark L. Pocock, U.S. Treasury, Office of Comptroller of the Currency Daylight, television schedules, and time zones can alter timing and induce temporal coordination of economic activities. With the Amer- ican Time Use Survey for 2003–2004 and data from Australia for 1992, we show that television schedules and the locations of time zones affect the timing of market work and sleep, with differences in timing being generated partly by returns to coordination with other agents. The responsiveness to time zone differences is greatest among workers in industries in national markets. An exogenous shock resulting from an area’s nonadherence to daylight saving time leads its residents to alter work schedules to coordinate with people elsewhere. I. Introduction Coordination is central to economic behavior. The production of goods and services typically requires the services of complementary inputs, in- cluding services of workers of different types. Firms often cooperate with We thank Isaac Ehrlich, Michael Kackman, Peter Matthews, Gerard Pfann, and participants in seminars at several universities for helpful comments and Rick Evans for his highly competent research assistance. The views expressed here do not necessarily reflect those of any of the organizations with which the authors