Please explain whether the following statements are true or false.
Question (a): If the owner of a business pays himself no salary, then the accounting cost is zero, but the economic cost is positive. (True or False) Please explain.
Question (b): A firm that has positive accounting profit does not necessarily have positive economic profit. (True or False) Please explain.
Question (c): If a firm hires a currently unemployed worker, the opportunity cost of utilizing the worker's service is zero. (True or False) Please explain.