[grkvlt]

> I don't need to be able to short his inventory

that's because it wouldn't do you any good. if, however, the used car salesman is engaging in fraud and selling expensive cars way under their market value while buying inventory at inflated prices, you could expose this by borrowing a friends mercedes, selling it for USD 100000 (then buying it back at USD 1000, so you can return it to your friend) making a nice profit along the way.