Day trading and HFT are not for the common man. But regular long term investing is. Getting a part time job is only a good idea if you have very few assets. Su

Day trading and HFT are not for the common man. But regular long term investing is. Getting a part time job is only a good idea if you have very few assets. Suppose you have 50k in salary and 50k in assets, then it's much easier to earn an extra 5k per year than it is to get an extra 10% return on your investment. However, if you have 50k in salary and 500k in assets the story is the other way around. Investing 500k for 10 years with 6% interest instead of 3% interest leads to gains of 395k and 172k respectively. In this case making an effort in investing your money sensibly will lead to an extra 22k every year. A substantial difference. And as your assets increase your investment strategy only becomes more important. Then there's the issue that not investing your money simply isn't a viable option. Inflation will chip away at your money at 3% per year, so you lose 25% of your money every 10 years if you stick your money in a checking account. Then there's the issue of employer-based 401k matching. You pretty much have to invest here, otherwise you lose out on free money. And if you just pick some investment funds at random you're going to do very poorly indeed (because many 401k funds are basically scams)[1]. [1] See http://www.pbs.org/wgbh/pages/frontline/retirement-gamble/ http://www.pbs.org/wgbh/pages/frontline/retirement-gamble/