In many cases, yes, it means not fit for export
It's not *all* economics. Most travelers are encouraged to stay away from exactly those types of food which are quite "wet"--lettuce, tomatoes, fruit. Basically: the drier the better, the more well-cooked the better, and the more acidic the better (part of the appeal of fresh ceviche is that the lime juice kills several nasty things--"cooking" it chemically).
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A stupid despot may constrain his slaves with iron chains; but a true politician binds them even more strongly by the chain of their own ideas;...despair and time eat away the bonds of iron and steel, but they are powerless against the habitual union of ideas, they can only tighten it still more; and on the soft fibres of the brain is founded the unshakable base of the soundest of Empires."
Jacques Servan, 1767
