Ted quits his $60,000 minus−aminus−year job to be a stayminus−atminus−home dad.

The opportunity cost of his decision is at least $60,000. 
Opportunity costs refer to the benefits you would have received by taking an alternative financial action, it is also known as alternative cost. It is a  benefit that a person could have received, but gave up, to take another course of action.

It is true hope it