This public policy has given rise to a lively black market (excuse me). Just before Christmas the illegal price for 'blue' dollars at exchange shops was 12.87 pesos. If one lived in Buenos Aires, one could buy so-called 'green' dollars at the better rate 13.07 pesos. Why 'green'? The dealers who pay this rate stand planted, so to speak, in Calle Florida in the country's capital city, and the ever humorous porteños call them 'arbolitos', or 'little trees'—hence green. Finally, if you badly need dollars to import parts for your car factory or tires for your tractors, the inexhaustibly inventive Argentinians have found another, though more risky way, of supplying them, by purchasing state bonds for pesos and selling them for dollars on Wall Street—at the 'grey' rate of 11.47 per cent.