This chapter considers some of the extensions and challenges to the mone-tary approach of exchange rate determination. The MAER model empha-sizes financial asset markets. Rather than the traditional view of exchange rates adjusting to equilibrate international trade in goods, the exchange rate is viewed as adjusting to equilibrate international trade in financial assets. In the MAER model changes to money demand and money supply cause adjustments to goods prices and the exchange rate. Since goods prices adjust slowly relative to financial asset prices, and financial assets are traded continu-ously each business day, the shift in emphasis from goods markets to asset markets has important implications. Table 15.1 lists the standard deviation of the percentage changes in prices and exchange rates calculated for four coun-tries. Over the period covered in the table, we observe that spot exchange rates for the four countries studied were much more volatile than prices.