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In addition to my comments above, I think another useful metric of positive activity is a moving average of the first derivative of karma with respect to time, and possibly other variables with respect to time (Recent Karma Velocity!). A moving average, however weighted, has some advantages (as long as you have that sliding window of time, it keeps people incentivized to keep contributing.) Perhaps a first step towards this would be to show the moving average of the first derivative (with site configurable time interval of course) in the karma history. Then perhaps draw up some proposals based upon observed behavior.