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In the market shown in Exhibit 3-15, the equilibrium price and quantity of good X are:  

_____________is the extra output or change in the total product caused by the addition of one more unit of variable output.

Fill in the blank(s) with the appropriate word(s).

________ creates an informational equilibrium in which people trust the wisdom of others and ignore their own information

A) Anchoring B) Hedging C) Sniping D) Herding