Potatoes will sustain you. most other plants won't. So it's not just about square footage in your garden. Potatoes are vulnerable to blight (that thing that starved the Irish two centuries ago). If you get the blight, it destroys your soil -- you can't grow potatoes in that earth any longer.
Raising chickens is the most cost effective meat source your can raise yourself in a small area. It is unpleasant, smelly, bloody work, and most people would not like doing it at all. But it has the largest payoff for the work and time you put into it.
I think if grow potatoes in bags then you can separate soils.
How is blight transmitted? Would store bought potatoes have it?
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