But - perhaps more relevant to the HN audience - I have noticed a surprising amount of financial illiteracy among the tech-savvy middle-to-wealthy class as well. A lunchtime conversation with my coworkers showed that most put more faith in their own instincts with picking stocks than in index or mirror funds (something that evidence shows is very unlikely, but people like to believe). Another time, I found that a majority of my coworkers were filing their stock-option taxes incorrectly.
Though no doubt wealthy folks are more literate (including financial literacy) than the poor, my suspicion is that most of the difference in financial outcomes comes to the fact that poor people simply have less capacity to save than middle/wealthy, and more severely feel the impacts of poor decision making.