Cont-Bouchaud percolation model including Tobin tax
  The Tobin tax is an often discussed method to tame speculation and get a source of income. The discussion is especially heated when the financial markets are in crisis. In this article we refer to foreign exchange markets. The Tobin tax should be a small international tax affecting all currency transactions and thus consequently reducing the destabilizing speculations. In this way this tax should take over a control function. By including Tobin tax in the microscopic model of Cont and Bouchaud one finds that Tobin tax could be the right method to control foreign exchange operations and get a good source of income 
Gudrun Ehrenstein