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Surprisingly, this is the type of comment I love.

"Surely this only works on idiots?" 

The comment was in response to a clip I'd posted about how decimals and commas elongate a number.

For example:

50,000.00

50,000

50000

50k

In the clip I show an ad promoting a $50k cash giveaway and make the point that it would have been more impressive (though less poetic) had they used $50,000.00.

It's known as Magnitude Representation (Coulter, Choi and Munroe, 2011).

So why...