Suppose you run a soy dairy and your two primary products are tofu and soy milk. Also, suppose S1 on the graph to the right is the supply curve for tofu, showing the relationship between the desired quantity supplied of tofu and the market price of tofu.

   An increase in the market price of soy milk makes the production of soy milk more profitable. Even though the price of tofu doesn't change, it would make sense that the dairy would choose to produce less tofu as it uses more of its labor and soybeans to produce soy milk. This is shown as a shift back in the supply of tofu from S1 to S2, indicating that the relationship between the desired quantity supplied and the market price of tofu has changed, with less being supplied at every price.

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