Prices Crash, I Rise

Yifan activates a system by chance with a pop-up telling him that everyone in this world will lose 1,000,000% in purchasing power except for him. The following day, the market crashes. Luxury cars only cost 1 yaro each and mansions 5 yaros each. With hundreds of thousands in his account, Yifan suddenly becomes a rich man with enough money to buy everything on Earth!