Hi Glenn,
When you short something, you pay a borrow fee to the lender. If the position being shorted is hard to borrow (limited supply, high demand for shorts), the rate paid will go up, and this is what we highlighted in our Crypto peice on Tuesday – essentially the cost of shorts had increased because there was more demand on the short side relative to the long side.
Shorting more generally is an interesting subject:
- An owner of a stock, or asset, can loan out his holding in say BHP to trader X who pays interest to the owner for the privilege.
- Trader X then sells the borrowed asset hoping to buy it back cheaper in the future.
- When Trader X has covered (bought back) the position, they return it to the owner and stops paying interest.
Traders can short cryptocurrencies, but the mechanism is different from traditional stock shorting because crypto markets operate under different rules — there are no brokers lending physical assets like shares. Instead, crypto shorting is usually done via Futures and perpetual contracts on platforms like Binance, Bybit, OKX, etc, but the same mechanisms around the costs prevail, and the same read throughs apply.