Wages determination and Interest income:

A- What should happen to the number of workers hired if a competitive employer's wages exceed its marginal revenue product (MRP)?

B- Does a monopsonist employer pay its workers a greater, less than or the same wage as a competitive employer?

C- If interest rates are greater than zero, presents goods have a greater, less or equal value compared to future goods?

D- Suppose that firm A is a monopsony that demands labor and XYZ Union is a monopoly that provides labor. Other things constant, the equilibrium wage and quantity of labor will depend on what factor?