Ombow, Lol. I wasn't much of an athlete, but decent at tennis and skiing.
With investing, taking a large position assumes that you know A LOT about the company, sector, competitive landscape, and can analyze financial statements, etc. So in other words, you have to be like Warren Buffett --> an uber brainiac who reads 500 pages/day. So that obviously rules us out. The alternative is extreme diversification (S+P 500), and also figuring out a way to manage one's own temperament / emotions enough to 'stay the course'.
In 1 minute (video below), Buffett explains why investors like us need - 1) extreme diversification, and 2) should not trade. Concentration is only for people who really know what they're doing, and can accurately and consistently analyze businesses. Face it, that's not us -
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