Answer:
A farmer would chose a luxury crop over a high caloric or nutritionally valued crop because a luxury crop would generate them more profit.
These are non-subsistence crops, ones that are not necessary to survive and be healthy, but luxury goods like the name implies. People are willing to pay more for them for this reason.
North Vietnam went to war with the republic of Vietnam via it’s proxy the Viet Cong, in the attempt to get south Vietnam under the control communist party.
I hope that helps.
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