olive oil for ear wax When IHS Markit produced a euro-area purchasing managers index of 58, more than most economists had forecast, it was at its highest level since February 2011. Any score above 50 indicates growth. Positive economic profit is sometimes described as excess profit. Interest rates have a very important impact on the exchange rate, which is the most important factor affecting the exchange rate. We know that the exchange rate is the relative price between the two countries' currencies. Like other commodity pricing mechanisms, it is determined by the supply and demand relationship in the foreign exchange market. Foreign exchange is a kind of financial asset, which people hold because it can bring the benefits of capital.