Capitalism allows unlimited private property with all the consequences for concentration of capital. If you don't want that you have to let go of something. Approaches that come to mind (and have been suggested) are
Basically I'm suggesting very general contracts that effectively change the linear reward effect you mention first to a consistent sub-linear one.
This thread is intended to provide a space for 'crazy' ideas. Ideas that spontaneously come to mind (and feel great), ideas you long wanted to tell but never found the place and time for and also for ideas you think should be obvious and simple - but nobody ever mentions them.
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