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There has been a drastic transformation of the economy, likely due to technological innovation and increased globalization. As a result, more jobs require the kind of skills that a college education provides. If we had more college graduates 50 years ago, it's far from certain whether there would be enough jobs that would demand their skills (this is a common problem in Asian and Middle Eastern countries today). So yes, a college education is increasing people's income, but the utility of that education must be viewed in the larger context of a new global economy that privileges services/information to manufacturing/agriculture. It's interesting to note that the same people complaining about the fate of the middle class would have us go back to a manufacturing-oriented economy that has much lesser need for education.
Thanks for some more context :o I just realised that most of those college graduates are probably not in the 20th percentile in that graph. I have no idea why GGT would want you guys to go back to a manufacturing-oriented economy, we should ask her.
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This is adjusted for inflation...housing and healthcare are part of prices, and are therefore adjusted for. Think of it like this: what does your median household have today compared to 50 years ago? The median household still has a house, a large amount of food, and clothes. But now everyone has TVs, computers, cell-phones, internet, refrigerators, etc. I really don't understand how anyone can claim that people today aren't better off than their grandparents, who had far fewer household appliances, fewer cars, would never leave their state to go on vacation, etc.
I realise that it's adjusted for inflation, but I know that the costs of healthcare and education have been rising faster than inflation, and last I heard housing prices in many areas have been rising pretty fast as well. It's been identified as one of the most important reasons for your homelessness problem.