Illegal immigrants make up about what percent of all construction workers?

Assume that both the goods and the labor market are perfectly competitive. If at equilibrium, the wage rate is $20 per hour and the marginal product of labor is 4 units, the firm's marginal cost must be equal to:

A) $5. B) $24. C) $40. D) $80.

The 1935 Act granting workers the right to form unions and bargain collectively is known as

A) the National Labor Relations Act or Wagner Act. B) the Wheeler Act. C) the Taft-Hartley Act. D) the Modernization Act.