De facto currency April 2009. Both South African rand and Botswana pula circulate in Zimbabwe. The small French island of St. Pierre and Miquelon has the Canadian dollar as its de facto currency. Hong Kong Dollar is widely accepted in Macau, even though it hasn't gained any official recognition from Autoridade Monetária de Macau (AMCM) as legal tender in Macau. Currently, Macauese Pacata is pegged to Hong Kong Dollar at 1.029(buy)/1.032(sell). However, many merchants who accept Hong Kong Dollars may now offer to pay the difference between 2 currencies, such practice is often called '不补水' in Chinese. If merchandise priced in Patacas is
Currency substitution On the other hand, currency substitution leads to the loss of seigniorage revenue, the loss of monetary policy autonomy, and the loss of the exchange rate instruments. Seigniorage revenues are the profits generated when monetary authorities issue currency. When adopting a foreign currency as legal tender, a monetary authority needs to withdraw the domestic currency and give up future seigniorage revenue. The country loses the rights to its autonomous monetary and exchange rate policies, even in times of financial emergency. For example, former chairman of the Federal Reserve Alan Greenspan has stated that the central bank considers the effects of