Economics, Department of

Economics, Department of http://hdl.handle.net/2027.42/60161 Thu, 20 Jun 2013 06:29:20 GMT 2013-06-20T06:29:20Z Economics, Department of http://deepblue.lib.umich.edu:80/bitstream/id/216774/220489.gif http://hdl.handle.net/2027.42/60161 Using uncensored communication channels to divert spam traffic http://hdl.handle.net/2027.42/97778 Using uncensored communication channels to divert spam traffic Chiao, Benjamin; MacKie-Mason, Jeffrey K. We analyze a simple, feasible improvement to the current email system using an uncensored (open) communication channel. Such a channel could be an email folder or account, to which properly tagged commercial solicitations are routed without filtering along the way. We characterize the circumstances under which senders would voluntarily move much of their spam into the open channel, leaving the traditional email channel dominated by person-to-person mail. We then show that under certain conditions all email recipients are better off when an open channel is introduced. Only recipients wanting spam will use the open channel enjoying the less disguised messages and cheaper sale prices, and for all recipients the dissatisfaction associated with both undesirable mail received and desirable mail filtered out decreases. Sat, 01 Dec 2012 00:00:00 GMT http://hdl.handle.net/2027.42/97778 2012-12-01T00:00:00Z Principal International Businesses http://hdl.handle.net/2027.42/93505 Principal International Businesses Levchenko, Andrei This is a dataset of the 50,000 largest firms in the world over the period 1978-2007. The data included are employment, total sales, year the firm was started, SIC codes for the firm's activities, and binary indicators for whether the firm is an exporter, and whether it is an importer. Wed, 05 Sep 2012 00:00:00 GMT http://hdl.handle.net/2027.42/93505 2012-09-05T00:00:00Z Formulation and Estimation of Production Function Models http://hdl.handle.net/2027.42/91919 Formulation and Estimation of Production Function Models Zellner, A.; Kmenta, Jan; Dreze, J. Sat, 01 Oct 1966 00:00:00 GMT http://hdl.handle.net/2027.42/91919 1966-10-01T00:00:00Z Estimation of Standard Errors of the Characteristic Roots of Dynamic Econometric Models http://hdl.handle.net/2027.42/91918 Estimation of Standard Errors of the Characteristic Roots of Dynamic Econometric Models Oberhofer, W.; Kmenta, Jan Mon, 01 Jan 1973 00:00:00 GMT http://hdl.handle.net/2027.42/91918 1973-01-01T00:00:00Z