a stock takes time change because flows take time to flow: stocks usually change slowly they can act as delays, Lags, buffers ,ballast and sources of momentum in a system. Stocks, especially large ones, respond to change, even said change only by gradual filling or emptying.
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the time lags that come from slowly changing stocks can cause problems in systems, but they also can be sources of stability ( a population that has learned many skills doesn't forget them immediately.)
the time lags imposed buy stocks allow room to maneuver, to experiment, and revise policies that aren't working & guide towards a good outcome.
