Table 11-8 Quantity LongRun (sets) Average Cost Elegant Settings manufactures stainless steel cutlery. Table 11-8 shows the company's cost data. Refer to Table 11-8. Elegant Settings experiences O economies of scale at an output of 300 or less and diseconomies of scale at an output level above 400. 0 increasing returns beyond an output level of 400. O diminishing returns up to an output level of 400. O economies of scale up to an output level of 400