The market kinda does have infinite growth baked in. To oversimplify more than a bit: The petrodollar system kind of ensures we export dollars to all countries who need to buy energy on the global market (not all, but a lot). That means the monetary supply has to go up or energy prices will skyrocket. So dollars are printed and the fed + treasury target a growth rate of 2%. Obv things are messed up right now, but that is how the system is designed. Infinite growth at 2% inflation per year.

E: To be clear I'm not claiming this is sustainable, only how the system is designed.