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A drought leads to scarcity, and scarcity leads to a rise in price.

Correct, but the OP doesn't even mention a drought when defending his title of why they should be stockpiled. He linked one Bloomberg article to reference that. He gave a brief nutritional analysis and then gave His theories of imported goods, and purposeful inflation as why they are expensive and should be stockpiled.

But you are correct. If demand stays steady and the supply is affected because of a drought in Vietnam, price increases are certain.

True, the mention of drought evaded me until I read his comment and only then I realised why they should be stockpiled.