Money and interest rates In addition to other factors, money plays an important role in interest-rate fluctuations, which are of great concern to businesses and consumers. Figure 6 shows changes in the interest rate on long-term Treasury bonds and the rate of money growth from 1950 to 2014. As the money growth rate rose in the 1960s and 1970s, the long-term bond rate rose with it. However, the relationship between money growth and interest rates has been less clear-cut since 1980. We analyze the relationship between money growth and interest rates when we examine the behavior of interest rates in Chapter 5.