The economist's distinction between quantity supplied and supply is an attempt to copy a controlled experiment.

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The economist's distinction between quantity supplied and supply is an attempt to distinguish between a specific quantity that a supplier is willing to sell at a specific price (quantity supplied) and the entire range of quantities that a supplier is willing to sell at different prices (supply). This distinction allows economists to analyze the relationship between price and quantity supplied as if it were a controlled experiment.

The Economist's Distinction Between Quantity Supplied and Supply Is an Attempt