Just Post

But lots of things can be pre ordered before they're actually available.

Services are an obvious example: I can buy tickets to a movie or a live event that will happen at some point in the future. Same with really any tickets or prepaid reservations, like plane tickets or hotel reservations or certain types of restaurant reservations.

But it can happen with all sorts of consumer goods, too. I can put in orders for stuff to be made to order: handmade/custom jewelry or shirts or mugs or commissioned artwork, a pizza that won't be made until I order it, etc.

For businesses, their supply chains require advance planning and ordering. The people who make peanut butter generally have the peanuts ordered before the start of the growing season, so they're buying peanuts that might not have been planted yet. The grocery store chain might be buying peanut butter before it's made.

When pork futures prices drop low enough, McDonald's will snatch up those contracts and take delivery of a bunch of pork to make McRibs and make them available for a limited time. At the time they buy the contracts (that is, order the pork), the pigs might not even be alive yet, much less slaughtered and processed.

None of this is defending the memory contracts, but the idea of buying things in the future is pretty common in the economy.