Mini, Few things are "fair" in Argentina. Foreigners who choose to live in Argentina need to accept local conditions which are quite different from those of Europe or North America. The dollar has been the preferred means of exchange for many things in Argentina, especially anything related to property, for a very long time. It is really the dollar, not the peso (or the austral or the funny money they were issuing during the crisis - patacones, Lecop etc) that has long been the real currency of Argentina.
While the dollar may be the defacto currency of Argentina, it is the official currency of many nations:
Countries using the U.S. dollar exclusively
British Virgin Islands
Caribbean Netherlands (from 1 January 2011)
East Timor (uses its own coins)
Ecuador (uses its own coins in addition to U.S. coins)
El Salvador
Marshall Islands
Federated States of Micronesia
Palau
Panama (uses its own coins in addition to U.S. coins)
Turks and Caicos Islands
Countries using the U.S. dollar alongside other currencies
Cambodia (uses Cambodian Riel for many official transactions but most businesses deal exclusively in dollars)
Lebanon (along with the Lebanese pound)
Liberia (was fully dollarized until 1982; U.S. dollar still in common usage alongside Liberian dollar)
Zimbabwe
Haiti uses the U.S Dollar alongside its domestic currency called "Gourde"
While the dollar may be the defacto currency of Argentina, it is the official currency of many nations:
Countries using the U.S. dollar exclusively
British Virgin Islands
Caribbean Netherlands (from 1 January 2011)
East Timor (uses its own coins)
Ecuador (uses its own coins in addition to U.S. coins)
El Salvador
Marshall Islands
Federated States of Micronesia
Palau
Panama (uses its own coins in addition to U.S. coins)
Turks and Caicos Islands
Countries using the U.S. dollar alongside other currencies
Cambodia (uses Cambodian Riel for many official transactions but most businesses deal exclusively in dollars)
Lebanon (along with the Lebanese pound)
Liberia (was fully dollarized until 1982; U.S. dollar still in common usage alongside Liberian dollar)
Zimbabwe
Haiti uses the U.S Dollar alongside its domestic currency called "Gourde"