What's holding back the middle class? Look in your closet.

I consider myself pretty thrifty, but when I moved a year and a half ago, I was astounded by the amount of useless junk stashed in every possible corner of my home: barely worn clothing, toys my kids had used once and forgotten, orphaned sports equipment, and of the course, the obligatory never-cashed gift cards.

There’s no useful data on this, but American consumers must waste an incredible amount of money, if you define “waste” as spending that does little or nothing to improve your quality of life. Over the course of the last three generations, luxuries have become necessities, while it takes more and more to make us feel successful. This “American Dream Inflation” is now as much of a problem as real economic stagnation, I argue in my latest book, Liberty for All: A Manifesto for Reclaiming Financial and Political Freedom.

Some things are well worth the money we spend on them, of course—a comfortable home, reliable transportation, kids’ education, entertainment that helps you relax. But Americans, including myself, are so addicted to pointless spending that a brutal recession and a genuine threat to our living standards have barely made a dent in the amount of money that flies out of our wallets for no good reason.

Consider two sets of numbers. Annual spending per person, adjusted for inflation, has jumped from $29,000 in 2000 to about $35,000 today. That would probably make sense if we were all making more money than we were 15 years ago. But we’re not -- on the contrary, in fact. Median household income, also adjusted for inflation, has fallen from $56,916 in 2000 to $54,417 today, according to Sentier Research. That’s a 4.4% decline in spending power. The typical family is earning less but spending more, as these two charts illustrate:

Source: Bureau of Economic Analysis, Federal Reserve Bank of St. Louis
Source: Bureau of Economic Analysis, Federal Reserve Bank of St. Louis
Source: Sentier Research, Census Bureau
Source: Sentier Research, Census Bureau

What makes this mismatch possible, of course, is borrowing. The total amount of debt owed by households (not including student loans) jumped from $7.3 trillion in 2000 to $13.4 trillion, according to the Federal Reserve. The amount of consumer debt grew by 84% during a time when the economy only grew by 72% and the population expanded by just 14%.

This insatiable need for stuff has made it difficult to distinguish what really improves our lives from what is mere clutter. Housing is perhaps the best example, as Jen Rogers and I discuss in the video above. In 1973, the average size of a new home provided about 550 square feet of living space per person. A new home today provides nearly 1,000 square feet for each inhabitant. Some of that additional space might improve your quality of life, but all of it? And at what cost? Meanwhile, new homes today have closets as big as bedrooms were a few decades ago, since we need cavernous alcoves to store all the juice extractors, faddish fitness equipment and Bluetooth-enabled gadgetry we’re convinced will make our lives better.