You've been hired by a firm to study their production process, which uses only labor as inputs. Last year, they employed 5 workers, and produced 100 units. This year, they employ 10 workers, and produce 220 units. What can you say about their current production?
• The are in a region of increasing returns to scale.
• Their supply elasticity is increasing.
• Their total variable costs are falling.
• All of the above.