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I think that we should accept a gradual, fair-to-all, falling POS percentage to put a break on an increasing coin supply. I don't think that it's crucial since, at the moment, the TEK coin supply at 42,000,000 is considerably less than most other established coins - surprising considering the amount of time that TEKcoin has been around.
Biomech's and thefix's suggestions seem reasonable to me, although I would prefer the POS return percentage to be simply and gradually, inversely-linked to the coin supply - possibly kicking in before we hit 75,000,000 ... I'm following Biomech's example of plucking a figure out of the air to get the ball rolling.
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As asked before :
https://bitcointalk.org/index.php?topic=320404.msg12532483#msg12532483Why not using coin supply instead of network load to adjust % ?
Doing that would eliminate the problem of big guys manipulating the staking and ensure a gradual/smoother adjustment.