A tax on suppliers will shift the supply curve up. This reduces the price received by sellers from PO to P2 and increases the price paid by buyers
Before the tax, the market equilibrium has price PO and quantity gO. A per-unit tax is now imposed on the seller from PO to P1. Quantity is reduced from 00 to Q1. Consumer surplus falls from (a + b + c + d) to 'a' and producer surplus falls from (e + f + g + h) to 'h'. Government revenue is (b + c + e + g) and deadweight loss is (d + f)
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