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There are many measures of inflation. The most widely
watched measure is the consumer price index (CPI) . Other popular indicators of
inflation include producer prices and unit-value indexes for imports and
exports. As we move back through the distribution chain from the consumer toward
the supplier of raw materials, a more complicated picture of inflation is
revealed at each step. Commodities, which prices can be monitored continuously
on centralized exchanges, and which are easy to measure, are the most volatile
indicators of all. An index of commodity prices, when plotted on a graph, looks
much like an index of stock prices.