Sinks and Faucets is ISK that leaves or enters Eve Online, not ISK that is exchanged between players and corporations
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Total Faucets, Sinks and active isk delta
These charts shows the total isk inflows (npc bounties etc) followed by the isk outflows to give the monthly change in isk as the third chart, the top right chart shows the active isk delta (players leaving the game with their isk) to then given the actual monthly change in isk in Eve, the bottom right chart then shows the total isk in the Eve.