Vanity is excessive pride in or admiration of one’s own abilities, appearance, or achievements. There is a fine line between vanity and ego. Ego is a person’s sense of self-esteem or self-importance.
Vanity may be the devil’s favorite sin, but ego can be a trader's (or investor’s) worst nightmare.
Ego gets in the way of rational, logical, and reasonable conclusions because fear and greed can tug on our egos and cause us to make mistakes.
Active share is a measure of the difference between a portfolio and a benchmark. It’s an important concept for investors wishing to judge how fund managers’ portfolios deviate from the index, and how that affects performance. It can show clearly when a fund is a "closet index tracker", one that holds shares very similar to the index but charges fees associated with active management. (The higher the active share, the more the fund differs from the benchmark).
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