If you are Argentine and can save, you will almost certainly do so in dollars. But imagine the government tells you that it will depreciate the peso at a rate of 2% per month. But if you buy pesos, it will pay you between 4% and 5% interest on them monthly. Your financial advisor will then recommend a very simple operation: exchange your dollars for pesos, buy bonds with those pesos or put them in a fixed term interest account, and buy dollars again once the difference has been harvested at the end of the month.