Figure 4 illustrates the impact of such a tax. The steel market is initially in equilibrium at point A, where provided (PMC1) by the bridge (PMB SMB), and Q1 units of steel produced at P1 prices. With the external factors with a cost of MD, produce optimal social is at point B, where the marginal social costs and benefits. Suppose that the Government taxed per unit of steel produced in some t = MD. This tax will operate as a the input cost for steel production, and will transfer the private marginal cost of it up by MD per unit product. This will lead to a new PMC, PMC2 curve, curve coincides with the SMC. As a result, the effective tax internalizes the foreign partner and lead to results in terms of the optimal social (point B, the number of Q2). The Government on a unit tax on the behavior of steel production in the same way as the fishermen of the water of the river. This is the kind of tax adjustments are often referred to as "Pigouvian tax," after the Economist A.C. Pigou, the first to suggest this approach to solve the external factors.
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