they say "if you can't sell your used games anymore, you won't buy so many new games anymore"
this is probably true, but the money you get for your used game comes from someone who has less money for a potential purchase of a new game then.
if i have $60 dollar and you have $60 and you need $60 more for two new games you want to buy in the next weeks, i can buy two used games from you for $30 each and you can invest that in one new game for $60 so that you can buy your two games.. but if i couldn't buy used games from you i would probably buy a new game instead. it would only change who buys how many new games
instead of me buying two used games from you and you buying two new games, i would buy one new game and you would buy one new game.
that's obviously not always exactly like that and some people wouldn't buy a console anymore if they could only afford less games but this is a factor. it's not as if the amount of money in this cycle increases a lot because of the used games market.
there is so many stuff to think about (i believe this study thought about a lot) that i'm not really sure if those calculations are really close to how it would be in reality. i believe it's something companies will only know if they try it. same with the steam success, i don't think it was that easy to say if it will work like that or not with all the sales. they tried it and saw that it works but i really believe it worked even better as they ever thought.
