Money
Money in the future will be very different due to overpopulation. The more people that uses the currency, the more likely that it will continue to be used. In just twenty-five years, the bitcoin may be gone, and the U.S. dollar might be the top currency. Money is very important for some people, and as overpopulation continues, more and more people will have to live in poverty, letting disasters like disease take over, since cures cost money. If you ask why the world will be in poverty because of overpopulation, it is because you have to spread the money somewhat equally in developed countries, and with more people to share them to, the more money our world has. Also, there will be a big change in pricing because there are more money being printed every day, but a lot more people and a lot less things to buy, so prices will gradually rise, and poverty and other problems will become more severe(this is also the reason why money before is worth a lot more than now).