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by arbitrary_name 2340 days ago
More importantly (and what you're kind of alluding to) is the RISK - sure, Tesla is beating the SP500 - but how about a week from now, or a year? He is taking on significantly more risk compared to someone who just holds the SP500 - that's fine if it matches your risk appetite, but most people fail to consider the other side of the risk/return coin.

Likewise, a good understanding of the overall portfolio is key - and not just investments. For example, if you work at Tesla and hold mostly Tesla shares you are running an even higher risk than the average Tesla investor - the risk of you getting laid off is closely tied to Tesla shares tanking - and failing to diversify away that risk can hit many of us very, very hard.