Question

What two lines on a cost curve diagram intersect at the shutdown point ?

Short answer

The curves are average variable cost (AVC) and marginal cost (MC).

Step-by-step solution

Shut down point :

A shutdown point occurs when a business sees non-profit in ongoing operations and, as a response, chooses to shut down partially or permanently in certain cases.

Explanation :

These two curves are linked because marginal cost may be calculated from total variable cost. This is illustrated in the diagram below:

The marginal cost curves cross the average variable cost curve at its lowest point, as may be seen here.