4. A firm is considering changing its plant size, so it calculates the average cost of production for various plant sizes, shown below. If the firm is currently using plant size C, is the firm experiencing economies of scale, diseconomies of scale, or constant returns to scale?

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Plant size A (smallest) B Average total cost $10,000 9,500 CDEF 9,000 8,800 8,800 F (largest) 8,900