There are a couple of good parts about this post. The first is the HN comments, which are an unintentional fountain of hilarity. But the second is the assumptions. 50% of the US population can't afford to put even a dollar into any sort of investment security. Of the 50% of the public that does own some sort of security, most of them are in the three-figures range. This index card, without realizing it at all, has ta…
Budget to save before you outlay your discretionary income. You might have to redefine discretionary to include car (if public transport suffices for your job), cable, etc. Don't lay out your budget and set aside $x for entertainment (eating out, etc). Savings will always suffer. Set aside desired savings first and then work with what's left.
As a corollary, just writing (and following) a basic budget does wonders. I've talked to a lot of people who said it was like getting a raise. You have regular expenses, so just plan out a basic month and then follow it. Something magic happens next: by being more conscious and deliberate about your spending, you spend less on un-necessary "wants" (if it's truly a need you'll spend it no matter what).
Plus, a written budget is like looking in the mirror: it's a reflection of your priorities, good bad or indifferent. If you see you're spending $300 / month on restaurants and $0 / month saving for retirement ... well, that shows what appears to be important to you. And, if you've got two brain cells to rub together, it shows an easy place to make some adjustments. Not that I have anything against restaurants ... even $200 and $100 would be far more reasonable.