If that were true then we would all be bankrupt
Food costs have dropped as much as healthcare have risen for example. The biggest problem I see is the 21st century lifestyle. It is still easy to live a 70's lifestyle:
One car
1,000 SF house
No Starbucks, Ipod, cable, cell phones, vido games, DVDs, digital cameras, large screen TVs, computers, "organic" food, vacation at the relatives, no eating out except for birthdays, etc. etc.
Single income, 70's lifestyle (actually probably saved up to 90's now

), and proud of it