This graph demonstrates the domestic demand and supply for a good,as well as a tariff and the world price for that good. 
According to the graph shown,the amount of surplus enjoyed by domestic consumers with free trade before the tariff is area:
Definitions:
Bond B
An investment product representing a loan made by an investor to a borrower, typically corporate or governmental, with specific terms for interest payments and principal return.
Yield To Maturity
The total return anticipated on a bond if the bond is held until its maturity date.
Bond B
A reference to a specific bond investment, often denoted for classification or tracking purposes.
Current Yield
The annual income (interest or dividends) divided by the current price of the security, often used in assessing bonds and other fixed-income investments.
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