When the world price of good a without trade is higher than the domestic price of good a, consumer surplus increases and producer surplus increases with trade.
Domestic supply will increase until it reaches equilibrium with world market prices. The world price is higher than the domestic price, so until the domestic price rises to the world price, the manufacturer will continue to sell on the global market instead of the domestic market. Therefore, domestic demand will decrease.
If the domestic price is lower than the world price, the country has a comparative advantage and needs to export its products. If the domestic price is higher than the world price, the country has no comparative advantage and must import the product.
Consumer surplus is a measure of consumer well-being and is defined as the excess of social valuation of a product over the price actually paid. It is measured by the area of the triangle above the observed price under the demand curve.
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