The term describes a situation where a causes a reduction in the buying power of income, even though actual income has not changed.

income effect; higher price

Explanation:

Income effect is a change in demand for a good or service as a result of a change in a consumer's purchasing power resulting from a change in income or price.

If price increases, the purchasing power is reduced and as a result of the income effect, the demand for a good falls.

Income effect is one of the factors that explain a downward sloping demand curve. the other effect is the substitution effect

the first successful, urban blues recording, selling more than 75,000 copies, was made in year 1920.

mamie smith recorded the first commercially successful example of the urban blues,   with the recording of “crazy blues”."crazy blues" was recorded on august 10, 1920, in new york city. within a month of the release of “crazy blues” it had sold 75,000 copies.