TY - JOUR AU - Anderson,James E. TI - Traders, Cops and Robbers JF - National Bureau of Economic Research Working Paper Series VL - No. 9572 PY - 2003 Y2 - March 2003 UR - http://www.nber.org/papers/w9572 L1 - http://www.nber.org/papers/w9572.pdf N1 - Author contact info: James E. Anderson Department of Economics Boston College Chestnut Hill, MA 02467 Tel: 617/552-3691 Fax: 617/552-2308 E-Mail: james.anderson.1@bc.edu AB - Why does illegal trade often flourish without formal enforcement, but sometimes fail? Why do illegal trade-reducing policies often fail? Why do States often appear to tolerate illegal trade? A model of trade with cops and robbers provides answers. `Safety in numbers' is a key element: the equilibrium probability of successful shipments is increasing in trade volume. Even without conventional fixed costs, safety in numbers implies scale economies which can explain the absence or robustness of trade subject to predation. Spilling over between markets, safety in numbers implies that illegal trade can foster legal trade and State revenue. ER -