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Question $20$ of $25$

Arthur and Robert have the same educational background. Both have been firemen in Atlanta for $10$ years. Arthur works from $11$ p$.$m$.$ until $7$ a$.$m$.,$ and Robert works from $7$ a$.$m$.$ until $3$ p$.$m$.$ Arthur's salary is $$800$ per month higher than Robert's salary. The wage disparity in this case is due to:

$$ efficiency wages.

market power.

compensating differentials.

discrimination.