Since using nonrenewable resources would seem to mean exhausting a fixed supply, then one would expect the prices of exhaustible natural resources to rise over time as the resources become more and more scarce Over time, however, the prices of most exhaustible natural resources have fluctuated considerably relative to the prices of all other goods and services Figure 13.9 "Natural Resource Prices, 1980– 2007"shows the prices of four major exhaustible natural resources from 1980 to 2007 Prices have been adjusted for inflation to reflect the prices of these resources relative to other prices During the final two decades of the twentieth century, exhaustible natural resource prices were generally falling or stable With the start of the current century, their prices have been rising In short, why prices of natural resources fluctuate as they do? Should the process of continuing to “exhaust” them just drive their prices up over time? Figure 13.9 Natural Resource Prices, 1980–2007 The chart shows changes in the prices of five exhaustible resources— chromium, copper, nickel, tin, and tungsten (relative to the prices of other goods and services)—from 1890–2003 Attributed to Libby Rittenberg and Timothy Tregarthen Saylor URL: http://www.saylor.org/books/ Saylor.org 715