Price is just one of the factors that affect producers' supply decisions. The supply curve isolates the impact of price on the quantity of a product supplied and assumes that all other factors stay the same.
Example 6
A tax will shift the supply curve up by the amount of the tax.
At every price level, less is supplied. For example, at price P0, originally Q0 is supplied. After the tax, Q1 is supplied at price P0.
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