If you’re a worker in a village who supplies said village with water, you are valuable to its people. There are two types of workers: Type 1 worker: Grabs an empty bucket or two, goes to the sweet water lake, fills them up, comes back and makes twenty people happy. He gets to drink some of that water along the way, and once he gets back, takes some of the water home.
Type 2 worker: Disregards how much of a “fair share” of water he’s getting. Instead of grabbing a bucket, grabs a shovel and a little cup, and disappears for a while. He’s digging a stream from the lake towards the village. Often he disappoints people for having returned from weeks of work with an empty cup. But the elders in the village for some reason believe in him and want to keep him (and throw him a bone so that he doesn’t starve for a little while). Some day, suddenly he shows up with a constantly flowing stream of water behind his back. He puts the Type 1 workers out of water delivery business. They’ll have to go find a different activity and “team” to work with. Type 2 worker, depending on how much control they retained on that stream, get to own a good chunk of it. Because the village wants to acquire and integrate that stream, they compensate the ownership of Type 2 worker in that stream with on par ownership in the village itself, typically land or such.
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