Profit Maximization | What is the difference between economic profit and producer surplus?

What is the difference between economic profit and producer surplus?

Cost of Production | True or False

Please explain whether the following statements are true or false.

a.  If the owner of a business pays himself no salary, then the accounting cost is zero, but the economic cost is positive.

b.  A firm that has positive accounting profit does not necessarily have positive economic profit.

 

c.  If a firm hires a currently unemployed worker, the opportunity cost of utilizing the worker’s services is zero.