Thanks for your well worded idea. There are members here who do such things in various ways. Some methods are "automatic" and others are triggered by market and AIM moves/directions.
One could also index PC by inflation possibly. That might help to compensate for that erosive effect. Cash has been a painful asset for most of the New Millennium as it's been an under-performing one relative to inflation. If/When interest rates finally come back to being a market driven level the problems with holding cash will be less severe.
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