Looks like no one added any tags here yet for you.
Long-run average cost curve
curve relating average cost of production to output when all inputs, including capital, are variable.
Short-run average cost curve
curve relating average cost of production to output when level of capital is fixed.
Long-run marginal cost curve
curve showing the change in long-run total cost as output increased incrementally by 1 unit.
Economies of scale
situation in which output can be double for less than a doubling of cost
Diseconomies of scale
situation in which a doubling of output requires more than a doubling of cost