Some years ago I experienced a loss in the market, the numbers are not important, what was important for me was how I dealt with it.
It took a while, after much soul searching it dawned on me that this loss was not 'mine', I no longer 'owned' it, it was past, I had learned from it and I decided to move forward.
Had I been trying to claw back the loss then I know I could never have let go of the ownership, it would have remained mine and would have continued to exert it's negative influence over my life.
It so happened that in a couple of years a completely different investment recouped double the losses, this was NOT my doing, it was a result of my letting go of the past.
A good business person is always aware of losses, but like John Chen of Blackberry and Leg0nd, you focus not on the loss, but on the positive ahead.
BBC News - Blackberry reports $5.9bn annual loss