The average work week in the United States has declined to fewer than 40 hours even though wage rates have been increasing.The best explanation of this phenomenon is that

Question

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The income effect of rising wages means that workers can afford to work fewer hours and still maintain their standard of living. The substitution effect would encourage workers to work more hours because the wage rate has increased. The fact that the average work week has declined suggests that the income effect is stronger than the substitution effect, leading workers to choose to work fewer hours even as their wage rates increase.

The Average Work Week in the United States Has Declined