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So you have whatever mental model you have dreamed up for zero marginal production costs. Does this zero cost production include zero spoilage during the zero cost logistics to move the zero cost food, water, and shelter?

Of course, we can build all of those things because we'd like it. Zero marginal cost world peace awaits us!

I encourage you to chase this! I also encourage a backup plan.

The "marginal" costs come from gathering and refining the raw resources that the machines operate on, and maintenance.

We already have machines that produce food. Why do you think they are still manned by an entire workforce? Out of sadism?

I find these guy inspiring:

Backyard aeroponics: self-sustaining farm for Wisconsin cold - https://www.youtube.com/watch?v=H4gsnFJRAB0

Internet of Farming: Arduino-based, backyard aquaponics - https://www.youtube.com/watch?v=X2wWTadsBDA