Discussion
Other things being equal, what causes a decrease in demand?
Answer: B
Correct answer: rise in the price of the commodity
Take the options against the law of demand and against what shifts the demand curve. A rise in the commodity's own price reduces the amount buyers take, which is the only decrease among the four.
A fall in its price does the opposite, raising the quantity demanded. A rise in the price of a substitute pushes buyers towards this good and increases demand for it. A rise in consumer income increases demand for any normal good. Note that the own-price change moves along a given demand curve while the other two shift the curve itself - a distinction worth keeping, though either way only one option reduces the amount bought.
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