The 50/80 Rule and Why You Must Never Fall in Love With a Stock
I once heard Mark Minervini say something that every trader should remember.
50 percent of past leaders once they top will go down 80 percent.
80 percent of past leaders will go down at least 50 percent.
Think about that.
The biggest winners of the bull market. The strongest charts. The companies with explosive earnings and dominant narratives.
Half of them will eventually collapse by 80 percent. Most will lose at least half their value.
This is why you cannot fall in love with your stocks.
It always starts the same way.
You admire the company. You believe in the product. You made great money in it before.
Now it feels familiar. Personal. Safe.
That is when it becomes dangerous.
Stan Weinstein outlined the four stages of a stock cycle in Secrets for Profiting in Bull and Bear Markets . Stage 2 is where fortunes are made. Institutional accumulation drives powerful advances. That is where you press your advantage.
But Stage 4 is different.
Stage 4 is distribution. Stage 4 is broken structure. Stage 4 is long, grinding declines that destroy capital and confidence.
Once a stock transitions from leadership to deterioration, the risk profile changes completely.
If earnings and sales momentum slows. If relative strength fades. If price breaks key support. If rallies become weaker and selling becomes heavier.
You get out.
There is no way to know how far down it will go.
That is the illusion that traps investors.
They wait for it to bounce. They wait to get back to even. They tell themselves it cannot fall much further.
But a stock down 30 percent can go down 50 percent. A stock down 50 percent can go down 80 percent.
A 50 percent decline requires a 100 percent gain just to recover. An 80 percent decline requires a 400 percent gain.
The market does not care how great the company is. It does not care how much you love the story. It does not care what price you paid.
Leaders lead on the way up and they can devastate portfolios on the way down.
Great traders are not loyal to stocks. They are loyal to their process.
When the characteristics change, they act.
Love your craft. Love your discipline.
But never fall in love with your stocks.