A competitive firm is using its economically efficient technology and is currently earning zero economic profits. The firm is considering hiring another employee.Assume nothing else changes in the market or the firm's production process. If the firm does hire an additional employee, then the firm would likely $\_\_\_\_\_\_\_$ its economic profit. The reason for this result is that the firm will experience $\_\_\_\_\_\_\_\_\_\_\_$ returns when it hires an additional employee.Group of answer choicesincrease; diminishingincrease; increasingdecrease; increasingnot change; constantdecrease; diminishing