I see a physical reality underlaying everything that has laws about increasing entropy in entire systems: In economics, just like in the physical world, the wealth of the entire systems tends to get diluted. Our "wealth" in this system can be considered as all the energy available on this planet. (A few people are trying to expand that "wealth" by working on stuff like orbital power satellites and hydrogen fusion, but right now, this is all we have.) If you distribute an equal share to everybody, then we all just get poorer, plus it gets more diluted as population grows over the years. A comfortable future in the short run, but bleak in the long run.
You can run counter to increasing entropy locally, by increasing the entropy somewhere else. For example, you can burn fossil fuel to do stuff but that puts CO2 in the atmosphere and decreases oil reserves. Both highly entropic. But the stuff you do with that energy decreases your local entropy by building things, heating houses above ambient, etc.
For the future, efforts to increase the scope of the system (space and fusion again) are the only thing that holds off the inevitable decline into an environment that can't sustain human life. The only way to do such stuff is to use some of that wealth to do those things. That's the function of capitalism, and why equitable sharing means the end of the human race.
Not that sharing is bad! Ideally, everybody would have whatever they need for a long and happy life. But we need to make sure that progress continues if we want a future. What then must we do? I do plan to give away everything. But I'm going to wait until my own long and happy life is over, and try not to be a burden on anyone else in the process.
