> sit in the middle of transactions and collect rent This is already a cottage industry, drop shipping. You make a shopify store, put up some marketing of peop

> sit in the middle of transactions and collect rent This is already a cottage industry, drop shipping. You make a shopify store, put up some marketing of people in sunglasses in front of brick walls, and sell cheap crap like fashion watches. Then when someone buys one, you go on Aliexpress and order it directly to your customers' address. If you're a real expert in arbitrage, you don't settle for making a couple dollars at a time. You charge people thousands of dollars to "teach" them how to make their own drop shipping stores.