This is absolutely a correct response to @YokoZar's assertion, and I would add that the families of the farmers who grow quinoa can also be in danger of malnutrition, since there is now an unreasonably huge economic incentive for the farmers to avoid eating their own quinoa, compounded with a dearth of other ways for nutritious food to be obtained on the open market. YokoZar's "diamonds" analogy only holds true in a market unrestricted by physical transportation difficulties and education gaps about nutrition (why not just spend our larger income to get more of the cheaper [less-nutritious] grain?). True, these might be solvable problems, but that doesn't mean we can ignore the fact that they exist today.
An interesting parallel in urban environments in more developed countries is the phenomenon of the http://en.wikipedia.org/wiki/Food_desert - malnutrition can occur even when families have enough money to avoid it.
An interesting parallel in urban environments in more developed countries is the phenomenon of the http://en.wikipedia.org/wiki/Food_desert - malnutrition can occur even when families have enough money to avoid it.