Interesting breakdown in what the typical American household spends their money on. The bubble chart is only so-so interesting, but the comparison with the 1940's household is intriguing.
Transportation costs went from 7.3% to 16.9%, while clothing went from 11.7% to 3.6%
I can see the car costs increasing because of a couple of reasons: More families own 2 cars now. And the cars they buy cost more (more options are now standard equipment, mandated safety equipment, etc).
Clothing - if you consider that in the 1940s people wore suits and dresses as daily attire, and today people have "work jeans" and "dress jeans", people simply bought better/more expensive clothes back then. Plus, factor in that the majority of clothing these days is made in China and Vietnam.