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Shouldn’t it be the other way around? Like, raise the rate when the profits go up, and lower it when they drop? If profits are going down, it's probably because there were fewer posts.
The idea is that we're tracing out the revenue-fee curve. If it goes up, the naive assumption is that it will continue going up in that direction.
I oversimplified a bit, for the sake of brevity. After trying out 21, I'd compare that result to the starting point of 84. That will tell me which side of 42 the peak is most likely on.
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