Answer:
The correct answer is option D.
Explanation:
The market for soybeans is perfectly competitive and the market for labor is perfectly competitive as well.
The price of soybeans is fixed at $6/bushel.
The wage rate is $30.
A farmer hires eight workers.
The marginal product of the eighth worker is 7 bushels.
The marginal revenue product of the eighth worker is
= [tex]MP\times Price[/tex]
= [tex]7\times6[/tex]
=$42
We see that the wage rate is lower than the marginal revenue product. So the farmer should increase employment till the wage rate and marginal revenue product become equal.