I don't get very well how a future is different than selling some of your stash for a retail client, I suppose the big advantages are for institutional investors....
I'm still getting my head around it to. Its basically a bet on how something will perform price wise.
What I'm confused about is some people are saying the futures involve no bitcoin, but they do my the standard 'old school' definition of a future, which is a transaction agreed upon to take place at some predetermined time in the future. So If I have bitcoin to sell, i'm shorting and if you want to buy bitcoin you are holding the long. If we decide on a price of $18,500 with a date of February 14th, 2018 then on that date I would, by assurance of our contract, sell you bitcoin at $18500. I think the gamble here is you are hoping the price will be higher than 18.5k and you would therefore being buying at a discount. I'm hoping btc is worth less than that, so I can basically sell it to you at a profit then buy another one at a lower price to replace my holdings, so net profit.
https://www.investopedia.com/university/futures/futures2.aspsays "
So, a futures contract is an agreement between two parties: a short position - the party who agrees to deliver a commodity - and a long position - the party who agrees to receive a commodity. In the above scenario, the farmer would be the holder of the short position (agreeing to sell) while the bread maker would be the holder of the long (agreeing to buy). We will talk more about the outlooks of the long and short positions in the section on strategies, but for now it's important to know that every contract involves both positions.
Read more: Futures Fundamentals: How The Market Works
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