
Alice has a cup. She loves it, and doesn't want to get rid of it. Belinda wants a cup just like it. She really wants one just like it, straight away, and she doesn't want to wait.
I ask Alice if I can borrow her cup for a month, on the understanding that she gets it back in identical condition. I'll pay her £1 for letting me do this.
I then sell the borrowed cup to Belinda for £10. That gives me a month to find a replacement cup for Alice. Luckily for me, Clare has one that she doesn't want, and she sells it to me for £7.
At the end of the month, I can give the used-to-belong-to-Clare cup to Alice. She's happy because, as promised, she's got a cup again. She's also got £1, for basically doing nothing.
Belinda is still happy; she's got the cup she wanted, for a fair price.
Clare is happy because she has got rid of the cup she didn't really want, for a fair price. She's now got £7 in her pocket, which she can spend on something else.
And of course I'm happy too. I've got £2 profit, which I can go spend on something else.
That's short-selling in a nutshell. Everyone ends up happy.

OK. The eagle-eyed among you are already crying foul. Alice didn't get "her" cup back; she got another one. When you're dealing in shares, not cups, this doesn't matter. Shares in public companies are all identical and can't be damaged. So this wheeze really does work.
But it only works for me if the price falls over the month. If the price rises, I may be forced to pay more to Clare to be able to fulfil my agreement with Alice. Ultimately, I could lose out. But the girls will still be happy. It's only me that loses out.
Another claim made by critics of short selling is that my intervention in the market forces the market price down. But they never explain how. And, having traded with Belinda, I'm a buyer in the market. Once my transaction with Clare is completed, I no longer have any exposure to cups at all. How does this manipulate the market any more than any other participant looking to buy or sell?
Oh. On no account try to repeat this analysis with one less girl and one less cup. That really is hazardous and, I'm told, not safe for work!
Filed under: Accounting 101, Capital markets, Economics with tags derivatives, market abuse, shares, short selling, stock lending
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