[fernmyth]

It is useful for humans if a farmer can lock in the price for their crop at planting time, rather than get a nasty surprise when they harvest. In financial terms, this is "selling a futures contract". It's also useful if the farmer sees a low futures price and chooses to plant something better. Likewise every producer and consumer of every crop, metal, hydrocarbon, etc.

Agreed that this author and the industry as a whole go too far in the direction of finance for finance's sake.