Venture debt, or loans to rapid-growth start-ups, is a puzzle. How are start-ups with no track records, positive cash flows, tangible collateral, or personal guarantees from entrepreneurs able to attract billions of dollars in loans each year? And why do start-ups take on debt rather than rely...

Financial theory creates a puzzle. Some authors argue that high-risk entrepreneurs choose debt contracts instead of equity contracts since risky but high returns are of relatively more value for a loan-financed firm. Conversely, authors who focus explicitly on start-up finance predict that...