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You're effectively saying that once someone decides to grow potatoes, apples are no longer scarce, because people might instead grow potatoes and trade them for apples. The secure, easy to use, non-wasteful, distributed calorie problem can only be solved _once_, so ALL potatoes are apples.

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If only apples existed and suddenly potatoes were invented, then plant-based carbohydrates just became less scarce.

If only British pounds existed and suddenly the Australian dollar was invented, you could suddenly do business in another currency.

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