I never said bitcoins grew exponentially, how can they there will only ever be 21 million of them.
Here's what you said in your first post:
We live in an exponential monetary system so the money supply has to be exponential in nature and character to fit in with it. If bitcoin were to ever challenge let alone replace our existing money supply it would to change to an exponential currency.
If you know that exponential growth is unsustainable, why would you suggest that Bitcoin
should grow exponentially?
I do understand what exponential growth is (that's why I recommend looking at Dr Bartletts videos)!
I've watched them quite a few times and recommend them to everyone who seems remotely interested.
Unless we have sudden depopulation then goods and services will need to grow to match a growing population and in doing so the money supply has to grow to match the goods and services that the people want.
No. Since Bitcoins are divisible to eight decimal places, there are 2,100,000,000,000,000 (2.1 quadrillion) base units of currency available. That's more than enough granularity, which is the only thing that matters. It doesn't matter if you only have 500 Satoshis (1 Satoshi = 1/10^8 Bitcoin) if a meal only costs 2 Satoshis.
Imagine you have a product it cast you 100 bitcoins to make 6 months later you can only sell it for 75 bitcoins that's defaltion
Except that your 75 Bitcoins have the same purchasing power (you can buy the same amount of stuff) as the original 100 Bitcoins.