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Re:Amazon’s Cashierless Store Is Almost Ready for Prime Time by crdoconnor on Saturday November 18, 2017 @06:59PM (#15731408)
I don't know exactly how you'd test this but I'll bet the UK has the heaviest change in the world.

Most of the rest of the world seems to have lighter coins and more smaller note denominations, which is way more convenient.

Re:Amazon’s Cashierless Store Is Almost Ready for Prime Time by jpatokal on Saturday November 18, 2017 @07:24PM (#15731506)
Australian coinage is probably the heaviest in the world, particularly this monster: https://en.m.wikipedia.org/wiki/Australian_fifty-cent_coin