What is a market failure?
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It refers to the inability of the market to allocate resources efficiently up to the point where marginal social benefit equals marginal social cost.
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It refers to a breakdown in a market economy because of widespread corruption in government.
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It refers to the inability of the market to allocate resources efficiently up to the point where marginal social benefit equals marginal private cost.
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It refers to a situation where an entire sector of the economy (for example, the airline industry) collapses because of some unforeseen event.