My EDC includes a carefully stashed $50 bill.  Not too surprising, and very useful in urban situations.  
But this bill is versatile.  only half jokingly, I characterize it as multipurpose, the other use being for emergency fire tinder.
This begs the question, in what situations would you actually use a fifty to start a fire?  Actually, I can think of three situations where I needed to start a fire and would have used a fifty if that was all that was available.  Then there are the $20 situations, and so on.
Of course, dryer lint (to say nothing of belly button lint)is fairly abundant, quite effective, and much cheaper.
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Geezer in Chief