Ivar

The version that is not a bad idea, since you asked whether one exists: let somebody else carry the risk.

If a buyer genuinely cannot pay in full today, the arrangements that work are ones where a third party pays you now:

• The buyer borrows from a bank or credit union and pays you the full amount.
• The buyer waits and saves, and you sell to somebody else meanwhile.
• The buyer pays a deposit and collects when the balance arrives, with nothing handed over until then.

That last one is the only instalment-shaped thing worth doing, and it is really just a deposit. Keep it modest, put the terms in writing including what happens if they change their mind, and do not take the car off the market for longer than you can afford.

And be alert to the shape of it — an offer at full asking price, from a stranger, with unusual payment terms, is a very common pattern in vehicle sale fraud.

Start with short selling, using something that is not a share.

You believe the price of a particular bicycle will fall. So you borrow a bicycle from a friend, promising to return an identical one later. You immediately sell it for 100. If the price falls to 60, you buy one for 60, return it, and keep 40.

That is short selling: borrow, sell now, buy back later, return, pocket the difference.

Now notice the asymmetry, which is the whole story. If you buy something for 100 the worst case is that it becomes worthless and you lose 100. If you short something at 100 and the price rises to 500, you must still buy one to return — and your loss is 400. There is no ceiling on how high a price can go, so losses on a short position are unlimited while losses on an ordinary purchase are capped.

Everything else follows from that.

Now the squeeze itself, and why waiting is not always possible.

A short seller has borrowed something. The lender can ask for it back. And because the position can lose more than the account holds, the broker requires collateral, and demands more as the price rises. When the price climbs, the short seller faces a choice: post more money, or close the position by buying.

Here is the mechanism. Buying to close a short is a purchase like any other, and purchases push the price up. So a rising price forces short sellers to buy, and their buying pushes the price higher, which forces more of them to buy.

That feedback loop is the squeeze. It is not driven by anyone's view of the company's value — it is forced buying by people trying to limit losses, and it can carry the price far above anything justifiable while it runs.

The answer to "why can they not wait" is: because they may be required to post collateral they do not have, or the borrowed shares may be recalled. Being right eventually is no help if you are closed out first.

Nothing here is advice about your situation, and I will not comment on the company — but there are general lessons that people who have done this consistently point to, and your framing invites exactly those.

Concentration. A single company is an enormous amount of specific risk for no expected extra return. The whole point of diversification is that company-specific disasters average out across many holdings; with one holding they do not average against anything. This is the lesson most people take from their first individual position, and most take it the way you are taking it.

Buying shortly after a listing. New listings are a particularly difficult moment to judge. There is little trading history, insiders may be able to sell after a period, and attention is at its peak — which is generally when prices are least connected to anything durable.

Having no thesis you could be wrong about. If you cannot state, in advance, what you expected and what would show you were mistaken, then you have no way to distinguish bad luck from a bad decision afterwards.

The other side worth mentioning: this is not free, and it is why the practice matters.

A disputed transaction typically costs the merchant a fee on top of the amount, and merchants with high dispute rates face higher costs and can lose the ability to accept cards. That is the pressure that keeps the system honest, and it is why an establishment altering tips is taking a much larger risk than the difference on one bill.

Worth also mentioning it to the restaurant. If it was a genuine error they would want to know, and if it was not, the dispute record is what eventually catches it.