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It's also like selling stuff. You buy 5 icecreams for 0.50$ each, and then try to sell for 1$. But do you really know that you sell all those icecreams in 5days? Maybe you will sell for less than 0.5$, maybe 0.25$ because nobody is interested in fish taste icecream.

I only thought of the speculative aspect of it. Nice way to conceptualize how futures work.

yeah pretty much :)

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