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Well, yes, exactly but, by definition, a curve cannot be a gradient. The two inputs are SP and reputation which is, essentially, the total of all the votes you have ever received but the bigger votes carry more, obviously.
I probably need to explain all the research I have done as it all interacts. The result of everything is that less than 100 people control 80% and less than 400 control 90% - distributed? I think not.
This is the power struggle which has led to steem being where it is. It should by the valuation models I use be at 4 cents