In the case of inconvertible paper currencies, adjustment is achieved primarily through exchange rate changes rather than through specie flows and domestic prices. Exchange rate deviations from PPP that underprice one country’s goods and overprice the other’s will, on the market for foreign exchange, precipitate a deluge of the currency of the high-price country seeking conversion into the currency of the low-price one to make cheaper purchases there. The resulting surplus of the overvalued currency and shortage of the undervalued one quickly bids the exchange rate back to PPP equilibrium.