In an isolated economy, the only two factors that can directly affect the market price of a commodity are changes in its supply and changes in consumer demand. In such an economy, the total consumer demand is directly proportional to the population size.
If the statements above are true, then it is also true that in this isolated economy:
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(A) any increase in the market price of a commodity is the result of a decrease in its supply
Since there are only two factors that can directly affect the market price of a commodity are changes in its supply and changes in consumer demand. Therefore, any increase in the market price of a commodity can not be attributed to a decrease in its supply alone.
Incorrect
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(B) if the population size remains constant, an increase in the supply of a commodity will lead to a decrease in its market price
If the population size remains constant, the consumer demand will remain constant and any increase in supply will result in decrease in market price.
Correct
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(C) if there is a decrease in the population size, then, other things being equal, the market price of commodities must increase
A decrease in population size will result in decrease in consumer demand, resulting in decrease in market price of commodities.
Incorrect
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(D) the market price of a commodity is inversely related to the size of the population
The market price of a commodity is directly proportional to consumer demand which is directly proportional to the size of the population.
Incorrect
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(E) whatever changes in supply occur, there will be compensating changes in consumer demand
Any changes in supply may result in corresponding changes in prices and NOT in compensating changes in consumer demand. This may be the case with essential commodities.
Incorrect.
IMO B