This chapter presents the inverse correlation between the U.S. dollar and commodity prices, which is one of the most consistent and reliable intermarket relationships. The close positive link between commodities and foreign currencies, and the role of the correlation coefficient in measuring the strength of a relationship between two markets are described. The correlation coefficient indicator is especially helpful in intermarket analysis, which is based on relationships between markets. It not only allows to put an objective number on the strength of those relationships, it also allows to tell when the relationship is strengthening or weakening. The difference in the behavior of gold from other commodities is also highlighted. Gold does not always act like other commodities because of its additional role as an alternate currency. Gold is not just the world's strongest commodity. It is also the world's strongest currency.