If the planner chooses to produce less than the equilibrium then the value placed on the last unit of production by buyers exceeds the cost of production.
What is equilibrium?
Economic equilibrium, as used in economics, is a state in which forces such as supply and demand are in balance and the values of economic variables will not change in the absence of external influences. Equilibrium, for instance, happens when the quantity demanded and the quantity given are equal, as in the classic text perfect competition.
In this context, market equilibrium refers to the situation in which a market price is set through competition in such a way that the quantity of goods or services demanded by buyers and the quantity of goods or services provided by sellers are equal. This pricing, which is frequently referred to as the competitive price or market clearing price, tends to remain constant barring changes in supply or demand. The quantity is known as the "competitive quantity" or market clearing quantity. Economic equilibrium, however, also holds true in imperfectly competitive marketplaces and takes the form of a Nash equilibrium.
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If a benevolent social planner chooses to produce less than the equilibrium quantity of a good, then?