The recession reacquainted millions of Americans with the idea of a household budget. That's great news for savers, and horrible news for the luxury goods business. Or that's what we all thought. Things have taken an odd turn recently. It looks like both luxury goods and discounters are now a great place to invest. Let's take a closer look, and figure out what the heck Americans are thinking.
The flagging middle
In order to understand what's happening on the fringes of the retail space, let's set the bar for middle-America. There aren't many brands that scream middle-class like Gap
As the following chart shows, Gap's revenue has struggled to stay flat since 2009. DineEquity has slipped 34% over the same period. Both brands suffered from a cost-conscious public, and an inability to conform to consumers' new needs for value.
Revenue TTM data by YCharts
If these two are the baseline reading for middle-America, then let's take a look at the outliers' performance -- the high and low brands.
Milk and diamonds
Again, let's look at a couple of clearly-defined brands. Walmart
On the high end, it doesn't get much pricier than diamonds and designer bags. Tiffany's 
Revenue TTM data by YCharts
Boom.
Welcome to crazytown
While this might make little sense on the surface, the Wall Street Journal has a theory. The paper calls it a high-low trend, where "[s]hoppers pinch pennies on basics but splurge when they see something they really want." This explains the ground falling out from the middle-class centered brands, and the strength on the high and low ends of the retail spectrum.
The problem with this theory is that it clearly cherry picks. While the charts I presented earlier do reflect what's happening, they don't show the whole story. Lots of other companies are doing well in the middle, and others on the extremes are doing poorly.
I prefer my own explanation -- the sofa-bed theory. We've all sat and slept on sofa-beds, and they're horrific. They are both bad sofas and bad beds. But they try to have it both ways. I think a lot of brands in the middle are trying to have it both ways, to be both expensive and affordable. While on the extremes, companies are realizing that their strengths lie in being really cheap or really expensive.
Dollar Tree saw a 5.6% increase in comparable store sales last quarter. This was slightly higher than the 4.8% that Walmart had over the same period. Both of the retailers have focused on their core strengths in order to drive up sales. As they continue to manage their niches, both of these companies should continue to provide solid revenue growth to investors.
The bottom line
When the economy picks up, the middle class brands may have a resurgence. The Journal might be right about Americans holding off on medium-sized items, and any influx of cash into American wallets could alleviate retailers' problems. However, the sofa-bed theory accounts for more situations. It's another way to phrase the idea of diworsification.
Companies try to do more things than they have the skills to do well. As a result, consumers end up sleeping on lumpy beds, and sitting on couches with bars in them. At some point, people get fed up and just wait until they have enough money to buy the nice new couch. Then they save up for the nice new bed.
I like what Walmart is doing both in the U.S. and abroad -- well, not the bribery thing. International operating income rose 21% last quarter. No one else seems to be breaking into the international markets with the gusto that Walmart is displaying. That it's performed well during the recession is just icing on the cake.
But international sales aren't the only thing that matters. There's huge demand waiting to be unleashed in the U.S., once people are able to get back to some sense of normal. The Fool has a special report explaining why The Future is Made in America. In it, we detail which companies are positioned to change the face of manufacturing in the U..S. You can learn all about it by getting your free copy today.
