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A test for $1 can be a test for free.

A test for $1 can be afforded by anyone.

I'd say "can be afforded by the World for everyone". Sure, the average GNI (gross nat. income) for the poorest countries is about $2 (USD) per day, but affordability is more complex. However, if we taxed the World, and paid according to ability of nations to pay ... I mean USA could probably pay it for everyone and only have to not build an aircraft carrier (https://en.wikipedia.org/wiki/Gerald_R._Ford-class_aircraft_... says that is $12B, money to spare!).

[Yes, finance isn't that easy, the knock on effects would make the cost possibly greater, maybe less(!)?]

The logistics of getting goods such as food and medicine into third world countries have hardly anything to do with their manufacturing price. Even once you get them there, distribution is a nightmare. Obviously I'm not referring to countries with no actual economy to speak of.

The "$1" in a $1 test has very little to do with manufacturing costs, too.

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