Constant returns to scale refers to a situation in which a firm's output increases proportionally to its inputs, resulting in no change in average costs. In other words, when a firm doubles its inputs, it also doubles its output without any increase or decrease in average costs.
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Economies of Scale: Economies of scale occur when an increase in production leads to lower average costs. This means that as a firm produces more units of output, it experiences cost savings due to factors such as specialization and increased efficiency.
Diseconomies of Scale: Diseconomies of scale happen when an increase in production leads to higher average costs. This occurs when the firm becomes too large and faces challenges such as coordination problems and diminishing returns.
Long-run Average Total Cost (LRATC): LRATC represents the lowest possible average cost at which a firm can produce a given level of output in the long run. It takes into account all inputs being variable and allows firms to adjust their scale of operations for optimal cost efficiency.