[vacri]

Lots of countries grow all the agricultural products

Who grows cinnamon, vanilla, coca, and kola? How many countries grow all four, because I doubt it's "lots". Do they also have some form of sugar and aluminium industries? (or steel/tin industries for different kinds of cans, or glass industry for bottles (with something for caps)?)

Besides, saying "oh, but countries could, they just don't" is having your cake and eating it too - the fact that countries don't because it's massively uneconomical means that yes, it does take multiple countries to produce a can.

It's a bit like saying "it takes a superpower to land men on the moon". Oh, sure, you could say "no it doesn't - throw enough private enterprise together and get someone there", but the point remains, no-one will - it still takes a superpower to land men on the moon.