Over a period of time, the equilibrium price of a good increases and the quantity decreases. All of the following could account for this situation, except

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If the price of an alternative good or service decreases, producers may switch to producing that good or service instead, thus decreasing the supply of the original good and causing the equilibrium price to increase and the quantity to decrease. The other options (A, B, and C) all involve increased costs to the producer or decreased demand from consumers, which would also result in a decrease in quantity but an increase in price due to the law of supply and demand.

Over a Period of Time, the Equilibrium Price of a Good