First, lets be clear that either answer is okay. The problem arises when investors confuse one with the other or start out investing in a stock, then change their minds when something goes wrong.
Let me explain the difference between investing in a stock and investing in a company.
If you buy a stock:
See What Moves the Market.
If you invest in a company:
A trader may not hold a stock very long or may hold it a long time, depending on its performance. An investor buys a company with the intent of holding on to the stock for a long time.
When things Go Bad
As long as the stocks price is performing well, neither the trader, nor the investor has much of a problem. However, when the stocks price starts falling, thats another matter.The smart trader has an escape plan in place to prevent small loses from becoming big loses. The trader has no emotional attachment to the stock, so getting rid of the loser at a predetermined point is easy.
Many traders find that dumping a stock when it has fallen 7% or 8%, a good way to keep loses small. If you set your sell level higher, you are in danger of letting a normal market blip trip your sell signal, only to see the stock and market rebound. See Understanding Stop Loss Orders.
The problem arises when the trader decides they really like this stock and dont want to give it up so easily. In other words, theyve quit being traders and become investors.
The Problem
The problem is they usually dont know enough about the company to make intelligent decisions about whether to hold the stock or let it go. They are no longer smart traders and they arent smart investors.Any decision they make as an investor at this point will be a guess.
The investor is probably better off when things go bad, but only if you have the courage of your convictions. If the stock price drops, reassess the company and the market.
Did you miss something? Has something changed? Or is now the time to add to your holdings?
Dont jump on the sell at 7% loss rule if you truly believe in the companys long-term potential. If you become a trader at this point, you are robbing your future.

