Right, and the only reason he COULD trade them was because he had amassed a sufficient number that another party took the other side of the trade and also thought holding the 10,000 Bitcoin would be worthwhile - they weren’t being traded to flip because there was no market for that. Laszlo had stored up the collectibles in surplus - notice the transaction wasn’t 1 Bitcoin, or 20,000 Sats as the case might be today.. The guy who bought the pizzas was willing to hold a large amount of what was still a collectible at the time because he thought he would be able to also trade them on future - that they would hold value over time… A store of value if you will.. Szabo is the one you need to be reading/listening to:

Fountain

Bitcoin Audible • Reboot - Shelling Out: The Origins of Money [Nick Szabo] • Listen on Fountain

"The precursors of money, along with language, enabled early modern humans to solve problems of cooperation that other animals cannot – including...