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Isn't the currency being doubled each year a problem for growth itself ? Or I am not thinking right.

The math isn't 100% clear to me either, but the whitepaper says there is a 3.5yr cycle that resets Steem 1:10.

Could you elaborate more on it ?

It depends. Have you read the whitepaper, do you know where to find it? It is in the menu, in the upper right hand corner, third link from the top.

It will work like this: today, you have 10.40 Steem. Tomorrow, you have 1.04 Steem. And everyone else too.