A firm faces the following costs: total cost of capital = $4,000; price paid for labor = $20 per labor unit; and price paid for raw materials = $8 per raw-material unit. Initially, the firm can produce 2,000 units of output by combining its fixed capital with 200 units of labor and 500 units of raw materials. After the firm improves its production process, it can produce 3,000 units of output by combining its fixed capital with 100 units of labor and 400 units of raw materials. What valid conclusion can be drawn about the effect and reasons for the change? multiple choice It did not improve economic efficiency because more units were produced at a higher ATC using fewer economic resources. It improved economic efficiency because fewer units could be produced at a higher ATC using fewer economic resources. It did not improve economic efficiency because fewer units were produced at a lower ATC using more economic resources. It improved economic efficiency because more units could be produced at a lower ATC using fewer economic resource