@gimperion If you invest $1 and the price goes up to $100 or goes down to $0.01, you don't lose that dollar or win the $100 until you decide to execute a sale at $100 or sell it at $0.01 for a loss. Once you make the investment you certainly traded your money for a good or bad asset, but what defines that is the market fluctuation and your actions based on that.
You don't lose money just for trading.
False, the value in your portfolio fluctuates based on the market clearing price at which you can off-load that. Just because by accounting standards, the position is not closed and not evaluated as a loss as a profit, doesn't mean your ability to extract value from that position hasn't changed.
When people think along the lines that you mentioned, they get stuck in bad trades, holding through periods of long declines in hopes that they can clear a sale at their buying point ie bagholding. I'm not suggesting that selling then rebuying lower is a better option, I'm just saying only inexperienced (and irrational) traders valuate their portfolio position by via profit/loss accounting methods.