Employment-at-will is a common-law doctrine holding that a. an employer has the right to hire, fire, demote, or promote whomever it chooses b. employees can be asked to leave a company only if they are willing to do so c. employees are free agents, but employers must have a just cause for terminating them d. an employee must provide a minimum of two weeks’ notice before quitting a job

a. an employer has the right to hire, fire, demote, or promote whomever it chooses

Explanation:

Employment-at-will refers to a type of contract in which the employer can fire an employee for any reason; it won't have to establish a just cause to do it. Also, the employer can fire the employee without notice but the reason for the termination can't be illegal like firing someone because of religion. According to this, employment-at-will is a common-law doctrine holding that an employer has the right to hire, fire, demote, or promote whomever it chooses.

D. All of the above.

Explanation:

The break even price is when the economic profit equals to zero.

(B is correct)

The economic profit, include both type of cost:

the explicit: labor, materials, overhead selling and administrative

and the implicit: opportunity cost

(This makes A correct)

Also it is the point at which the Average total Cost is lower

(C is correct)