Have a little cup of coffee . . . for an enormous price. But remember, this costly cup of joe has a hidden perk. If you buy it, you get a share of a dairy farm thrown in.

The farm, Mossgiel Organic Dairy, is in Scotland. The owners claim they’re selling the most expensive cups of coffee in the United Kingdom. The drink is a flat white—a double shot of espresso topped with a layer of steamed milk. It costs 272 British pounds. That’s about $344 in American money. 

It works like this. You buy 34 shares in the farm and then you get the coffee. The free coffee can be redeemed at any of the 13 coffee shops in Scotland that use the dairy’s milk. 

What exactly does it mean to own a share of something? Once you pay, you possess a little piece of the company or property. If it prospers, you prosper. You don’t get all the profits, of course. You just get a little bit for each share you own.

Bryce Cunningham owns the farm now. “This coffee costs nearly 80 times the price of an average flat white in the UK,” he says. “We know it sounds crazy, but when you break it down, it’s a pretty good deal. How much is the future of farming worth?”

The goal? Sell so many shares that the farm can grow while staying sustainable. Produce more healthy milk. 

Shareholders receive other rewards too: farm tours, milk delivery discounts, and invitations to special events. But they also get a warning. They could lose all or some of the money they invest. Investing usually has a risk.

Mr. Cunningham uses a process to “brew” the milk. He says this gives the milk a creamier taste. 

Todd Whiteford owns a coffee shop that uses Mossgiel milk. “Theirs is the best,” he says. “I’ll argue with anyone about that.”

Why? People can buy shares to help good businesses prosper and grow.