Answer:
True
Explanation:
The production function is getting flatter since the marginal productivity of the 13th worker is lower than the marginal productivity of the 12th worker, e.g. the 12th worker produced 10 units per hour, the 13th worker only produces 9 units per hour.
The total cost curve will get steeper because the total cost of producing more goods will increase due to the lower marginal productivity of the 13th worker, e.g. since both workers earn $10 per hour, the units produced by the 12th worker will have a direct labor cost of $1 per unit, while the units produced by the 13th worker will have a direct labor cost of $1.11 per unit.