As the article mentions at the end, a big part of living within your means is reducing your spending -- and a lot of that has to do with recognizing what things are actually necessities. The chart of price increases mentions things like movie tickets, new cars, and private college tuition, which are certainly not necessities. Even high gas prices can be mitigated if you recognize the hidden costs of driving a fuel-inefficient vehicle long distances to and from work every day -- and that in many cases you're not forced to live so far away.

I recommend the Mr Money Mustache blog as a source of some decent advice about how to think more frugally and focus on early retirement: http://www.mrmoneymustache.com/