No. of Recommendations: 3
"Food" is fungible. Instead of Guatemalan grown bananas, you can eat USian grown strawberries or peaches, and the $2B keeps circulating in the USian economy.
That is true, but that doesn't mean you "save" $2 billion by buying domestic instead of importing. That's not how international trade works!
And by definition, buying the domestic alternatives is "worse" in terms of value to the purchaser (after all - if they had their druthers, they wouldn't have purchase the strawberries or peaches - they wanted the bananas instead!), so you end up harming your economy by some small increment in exchange for whatever increment of impact comes from buying domestic.