There is an inverse relationship between inflation and unemployment in the short run and this can be seen as an:. a. example of the equality-efficiency trade-off.
b. example of the impact of comparative advantage.
c. example of macroeconomic policy choices.
d. example of an externality. example of the use of abstraction in economic analysis.

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c

explanation:

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.

answercontrol is returned to method c;