There's a really cool produce market near me. This place has a truck they take to a city hours away and load it with produce once a week. On Saturday and Sunday they have a reverse auction where the prices keep going down until it's all gone. Restaurants and people looking for cheap food get great deals and no food goes to waste.
They're also really good at only stocking produce when it's a good time of year for it. Walmart will have peaches year round, but they're not good for like half the year. They also end up with some stuff that's just not ever available around here, like lychee and diakon radishes, when they can get it. Plus they carry stuff from local farms when it's available.
I feel like this is a business that could be replicated in a lot of rural areas. It's basically just a barn on the side of the road with very little overhead, but it's always busy.
The Mississippi Company was something like bitcoin. John Law basically invented fractional reserve banking by assuming the national debt in exchange for the right to print paper notes backed by France and exclusive trade rights to the Americas. The whole thing blew up because there was no mechanism to stop inflation, investors could buy an unlimited amount of shares of a finite investment.