It's not just about money. The bitcoin protocol is a decentralised ledger. It can be used for 'smart contracts' and all sorts of things that requires trust (read Lawyers). Money is just the first app of the block chain, like email was for the internet.
Money has evolved through human barter..
Man or Women 1 - has 10 carrots
Man or Women 2 - has 5 potatoes
Man or Women 3 - has 20 bananas
Man or Women 4 - has 2 pineapples
1 would like a potato, how many carrots for one potato ? 2 give me 2 carrots and i'll give you a potato .
3 would like a pineapple, 4 give me 7 bananas for 1 Pineapple ...
This is barter .. trading .. and a fair trade is healthy for everyone ... 1and2 can have carrots and potatoes for there lunch.. who knows they might sit down and have lunch together .. smile, laugh and learn a thing or too... if they cook lunch for 2 and 4 they might ever get some pineapple and banana cake for desert...