 Some central banks use a formula that triggers a change when certain conditions are met, while others prefer not to use a preset formula and frequently change the exchange rate to discourage speculations.The main advantages of a crawling peg are that it avoids economic instability as a result of infrequent and discrete adjustments (fixed exchange rate) and it minimizes the rate of uncertainty and volatility since the fluctuation in the exchange rate is kept minimal (floating exchange regime).For example, Mexico used a crawling peg to address inflation in the peso crisis.