Hi Tom, The idea of lowering the PC on dropping stock is also worth trying, but I have not done this. In this case it could be used with stocks as well as funds and the cue to start this could be a negative slope of 150-200 day EMA. It may be a way of dealing with the problem of AIM overbuying and using up the cash reserves on falling stock.
Here too I would be very conservative and make only small correction. If the stock starts moving up again and you've made a large downward correction you may end up selling your stocks at a loss.
In AIM when the stock drops and you make a buy, the PC-per-share drops already, in spite of the fact that you increase the PC by 50% of the buy. This is because the number of shares increases as well.
In my LD AIM spreadsheet I have a column that sets the PC percent correction per year, but for all stocks I have it set to zero. Only with mutual funds and some ETF's do I have it set to 4%.
Adam