I don't understand why your comment is prefaced with "Yet". Did you misread my comment? It seems like we're agreed that investing should not be done by reason

I don't understand why your comment is prefaced with "Yet". Did you misread my comment? It seems like we're agreed that investing should not be done by reasoning like "Amazon's strategy for the next couple of years involves X, Y, and Z, so I think they will be successful/fail." > For example, if as a tech person, you used your insights into the industry [...] ... then I would be radically under-diversified. If tech is doing well, my biggest asset (my career) is performing well. I'm most likely to need to draw on my stocks in an emergency precisely when they'll be doing poorest.