Understand it as buying power over time. 1sat today has the same purchasing power as 1sat tomorrow. In fiat terms you have to say 

0.9 because the $ looses its buying power over time. And, yes this formula is mathematically wrong. Funny, eh?!

bitcoin

I don't get when people say 1 sat=1 sat

SNisgay

Understand it as buying power over time. 1sat today has the same purchasing power as 1sat tomorrow. In fiat terms you have to say $1 > $1 or $1 = $0.9 because the $ looses its buying power over time. And, yes this formula is mathematically wrong. Funny, eh?!