According to rational consumer choice, the thing that will happen to the optimal quantity of consumption for a good if the price increases is that option c: it will increase.
What will occur if in response to a fall in its price a consumer buys more of a good?
The income effect is known to often take place if a reduction in the price of a good tends to increases consumer's real income.
This is known to often making them have the ability to buy more or to purchase all of the goods, so the quantity demanded is known to often increases.
Therefore, According to rational consumer choice, the thing that will happen to the optimal quantity of consumption for a good if the price increases is that option c: it will increase.
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