Middlemen in the Apocalypse

Camping enthusiast Qin Yu was camping out, and when he woke up, he found that he had arrived on Earth hundreds of years in the future? The future world is not the high-tech era as people have imagined, but... The end! Coming to the Apocalypse Awakening Doomsday Exchange System, Qin Yu became a middleman in order to survive in the difficult apocalypse. "What? One bag of rice costs one gold? I can buy ten bags with this one gold!" Ding~ One piece of gold can be exchanged for 500 points. Do you want to exchange it? "Hahahaha! I can buy fifty bags of rice again! The middleman brings in money so quickly!"