Commodity-pricing data from The Economist show a dramatic long-run decline in 25 important real commodity prices from 1850 to 2015. This decline primarily occurred because the

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The long-run decline in commodity prices from 1850 to 2015 occurred primarily because the supply of commodities grew faster than demand. This can be attributed to technological advancements, improvements in transportation and communication, and increased global trade. As the supply increased, prices decreased due to competition among producers.

Commodity-Pricing Data from the Economist Show a Dramatic Long-Run Decline