The market supply curve shows how the total quantity supplied of a good varies as input prices vary, holding constant all the other factors that influence producers' decisions about how much to sell.

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The market supply curve shows how the total quantity supplied of a good varies with its price, holding constant all other factors that influence producers' decisions about how much to sell. Input prices are one of the factors held constant, not what the curve illustrates.

The Market Supply Curve Shows How the Total Quantity Supplied