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I think this is because inflation in the US has two tiers. There's the big "essential" stuff- housing, healthcare, education- which have skyrocketed in price and nowadays take a higher percentage of people's salaries. Then there's groceries, consumer goods, electronics, restaurants, which have gone up much slower. So in a way, that $12/hour was good in terms of the amount of non home cooked food you could get (or live music tickets or whatever other things you considered luxuries at the time). |
The tiers are relative to the labor component.
Goods & services that have gotten more efficient over time as we've introduced technology, automation, (what we do on this site) or been offshored.. have gone up slower than inflation.
Everything that has a fixed, domestic labor component has gone up faster than inflation.
There's really no other magic trick to it.
Food is a great example. Something like 40% of the country lived & worked on farms in 1900. That number is now about 1%. That means 40% of the entire countries labor was required to feed 100%, and now it only requires 1%. So a 2.5:1 to a 100:1 ratio change of food labor consumers to providers.
Other areas like education & healthcare, the lack of efficiency is often a selling point. Look at colleges that advertise student:faculty ratios or K-12 districts that talk about classroom sizes. In my experience we've probably actually gotten less efficient as everyones gotten much more precious about the education their kids receive.