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In the calculation, you said:

CONTENT_REWARD_PERCENT: 75% goes to authors and curators. 15% goes to witnesses and 10% goes to SP holders.

So does that get directly paid to SP holders, or put back in some sort of pool causing an inflationary effect?

Technically, SP holders are holders of VESTS. Your SP is calculated by multiplying the amount of VESTS by 483.452 (Current value of 'steem_per_mvests' on steemd.com). By slightly increasing this value overtime all VESTS holders see their amount of SP increasing.

Interesting... So steem_per_mvests is what increases, which increases the value of held VESTS... Thakn you so much for your insight!