it can affect the price of bitcoin?
Not sure what you're referring to specifically by "it" here?
If you're referring to futures markets, then yes. Because in the back-end, futures markets pretty much consists of buys, sells, and borrowing in which all 3 affects the markets in their own ways.
One can easily understand how the price gonna affect, if he knows the basic rule of supply and demand . It doesnt really matter if you are talking specifically about future trades or if people are holding their Bitcoins for long term. As there are fixed amount of Bitcoins out their to be bought, so if more people show interest to buy the coin, then definitely the price will rise and hence this affects the price. Similar things also happen while buying, selling or borrowing.