In a graph of short run cost curves, which starts rising first?

Question

Quizplus · Accepted Answer

The marginal cost curve starts rising first as it reflects the increase in cost associated with producing one more unit of output. When production is increased, initially, the cost of producing an additional unit may decrease due to efficiencies. However, due to the law of diminishing returns, there comes a point where producing an additional unit will start to cost more, causing the marginal cost curve to rise. This increase in marginal cost is what eventually pulls up the average total cost and average variable cost curves.

In a Graph of Short Run Cost Curves, Which Starts