In the given graph line A represents surplus
What is a surplus?
An item or resource that has more than is currently being used is said to have a surplus. A surplus can relate to a wide range of things, including money, goods, capital, and profits. A surplus in the context of inventories refers to items that are still on store shelves but have not yet been purchased. A surplus in a fiscal sense happens when income is greater than outlays. Governments may also have a budget surplus if there are any tax revenues left over after all expenditures for government programs have been paid in full.
In the graph the region under the demand curve and above the price line represents surplus hence in the given graph line A represents surplus
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