Most firms produce more than one product or service. For such firms, a change in the market price of one item will affect the desired quantity supplied of other products produced by the same firm. We can think of this as another way that the opportunity cost of producing an output has changed.

   If the market price of one item being sold by the firm rises, the firm will want to supply more of that item. This would be a movement along the supply curve of that item since its price rose. However, the supply curves of other things sold by that firm would shift back, because it would expend fewer resources producing those items whose price didn't rise.

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