An entrepreneur quits a 40,000€/year job and pays 25,000€/year in business expenses. The business brings in 70,000€ of revenue. Set the slider to her economic profit in € (accounting profit minus forgone salary).

5000 (answers within ±1000 count)

Accounting profit is 45,000€, but the venture’s true margin over her best alternative is $45{,}000 - 40{,}000 = 5{,}000$€. Economic profit asks not "did I make money?" but "did I beat the road not taken?"