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shminux comments on Checklist of Rationality Habits - Less Wrong
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Comments (186)
You can only add, subtract and compare like quantities, but log(50000*1dollar)=log(50000)+log(1 dollar), which is a meaningless expression. What's the logarithm of a dollar?
What do you need to "exponate" to get a dollar?
That, whatever that might be, is the logarithm of a dollar.
An arbitrary additive constant. See the last paragraph of Kindly's comment.
Well, we could choose factorise it as log(50000 dollars) = log(50000 dollar^0.5 * 1 dollar^0.5) = log(50000 dollar^0.5) + log(1 dollar^0.5). That does keep the units of the addition operands the same. Now we only have to figure out what the log of a root-dollar is...
It's really just the same question again -- why can't I write log(1 dollar) = 0 (or maybe 0 dollar^0.5), the same as I would write log(1) = 0.
$1 = 100ยข. Now try logging both sides by stripping off the currency units first!