For reasons that are going to become clear, a good decision tool seeks to reduce the role of cognitive bias (such as overconfidence, hindsight bias, … - Annie Duke

when we quit things, we usually follow the idiom out of sight, out of mind. We don't naturally track things that we're no longer in. This is likely what is causing the problem with the portfolio managers. When they enter into a position, they're tracking that every day, because it's part of the portfolio. But once they exit, they're not tracking it in the same way, because the position is now off their books. It's no longer part of their P&L statement, not as far as they can see in any obvious way.

As you build things, whether they're train tracks, or bookshelves, or relationships, or essays that you've written for classes, the endowment effect gaffs the scale even more, further escalating our commitment to failing causes.

The way our lives turn out is the result of two things: the influence of skill and the influence of luck.