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Skimming the article, it looks like they had 8 people and 0.6 acres of agricultural space.

Planted entirely in potatoes, that could grow 3800 calories per person per day [over the course of a year]. Given that is probably wasn't entirely potatoes, I'm wondering what sort of margin they had on their calorie production.

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Per the article, the margin was negative, they could only produce 86% of dietary needs.

Yes, but was that a totally inadequate plan performing as expected, or a plan with too small of a margin falling well below said margin?

You need more than potatoes for a sustainable diet, let alone an ecosystem.

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