Earlier quoted context omitted.
The markets are not as independent as they might seem. If the futures market gets ahead or behind of the other BTC markets, it creates opportunities for arbitragers to profit from the difference which has the effect of reducing the gap. It doesn't matter that they are cash-settled. For example, if lots of money start pouring into Bitcoin futures, the futures price will rise above the price on BTC exchanges. It will t…
More precisely, it is possible to replicate the final value of a futures contract (on Bitcoin or any other asset) up front, by trading in the spot market, even though a futures contract’s payoff is uncertain until it expires. Whatever the future’s value ends up being at its expiry, you can put together in advance a portfolio of holdings that will have the same value simply by borrowing a certain amount of cash and us…
So if 1 BTC@januar17 is priced 10 000 USD, you borrow 16 000 USD and buy 1 BTC. How does that help you?
> if you do this, the value of your holdings in cash (after paying interest on your borrowings) and in the asset are guaranteed exactly to equal the value of the futures contract at expiry,
Why? If the spot price at expiry is different from 10 000, let's say it sunk to 5 000, then you have to give back cash and you have 1 BTC that is now worth 5 000.
Could you illustrate how the equivalence comes out?