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ok, thanks! I have been reading the whitepaper that i had saved on my computer and it makes this clearer.

So, 15% goes to steem power holders. How is it distributed?

Every year?

non-stop, but I think it goes down over time (and will eventually approach zero)

Yes, that is better. Also, steem should always have a 2-3 dynamic inflation to fund the reward pool. I read that the inflation will go to 1% which I think is too less to fund the reward pool when there will be a lot more people in the platform.