skc
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I have however become absolutely convinced that the entry must be made on the basis of price. Firstly, as most FA/value investors will agree, the price must be at a discount to their judgement of where fair value lies. I think this is implied even though you suggest one can purchase a stock without regard to its price.
Timing entry based on technical analysis, which I think is what you are alluding to, for me is imperative even though I choose stocks based on FA.
I think you misunderstood what Craft and I were trying to say. There is certainly noting wrong about making an entry at the most advantageous price, and it's perfectly OK to time your entry on whatever TA method one deems useful.
But ultimately the decision to buy XYZ was based on the company's prospects (may be low PE, may be high growth, may be special event). Timing your entry using TA doesn't make it a "price based" entry. Or more correctly, price-action based entry.
So it makes no sense to exit based on price action (i.e. 20% stop loss or whatever). You should exit when earnings fall, or growth does not eventuate, or event no longer offer the right reward/risks.
As for exiting based on price, every man has his price. Just as when I am willing to buy based on my belief that the price is at a discount to fair value, why wouldn't I exit when I believe the price is at a significant premium to the fair value? Why wouldn't I use a stop loss to lock in capital gains and preserve capital?
When you exit because price has reach a premium to fair value... that is NOT what I deemed price-based exit. It is valuation-based exit and it's exactly what one would do.
As to price-action based stop at a loss for capital preservation - there are other ways to manage risk, with the three key pillars being position sizing, expertise in research/analysis and margin of safety.
If I think a stock is a bit riskier though, then I'll set the stop loss tighter - I shouldn't have too many of those, but the option is there.
What does it mean when the stock is riskier?
Doesn't it mean it is more likely to have larger volatility in price?
So does it make sense to have a tighter stop loss?
On a riskier stock a tighter stop loss will only whipsaw you out of position easier. You don't give the stop the opportunity/time/space to work out. If you want to enter a riskier stock, you need wider stop (if it must be price-based). And the way you manage risk is by having a smaller position.
Say I am buying a biotech company with a potential blockbuster drug approval in 3 months, yet if such approval is denied the share price can fall up to 60%... you size your position based on a 60% loss being an acceptable amount to lose. E.g. You want to risk $600 on this so you can only buy $1000. Don't go and buy $5000 position and have a 10% stop. It will be a complete waste of money.
Many newbies will say "$1000 position will only make me not a lot of profit"... but looking at reward before/without looking at risk with the same objectivity is the downfall of most investors/traders.
Chew on this for a bit more until you have a good understanding of the difference between price based stop (which is what you are proposing) and what Craft and I are saying.