The problem with the CPI basket is, it needs to be constant of products to be comparable, so NO technological advancement is considered in that basket. Instead, they use the price of butter and tomatoes. Well, a fictious 1950s person wouldn't care that is can buy more butter or tomatoes than we can, but would want smartphone and a plane ticket to thailand.
The monetary reason is that the reason those things go down is because of technology advances and not because of changes in the value of the currency. Inflation should be about the currency, and less about what cool advances people are doing to make cheaper TVs and better websites
The practical reason is that if the basics like rent and food go up relative to wages, then a lot of people end up crushed by the basics alone and have no disposable income left for the cool stuff. The baskets are often too biased towards spending patterns of those who live the good life and for whom luxuries actually matter
Have you looked at the actual weights?
https://www.bls.gov/news.release/archives/cpi_10142026.htm
Airline fares make up a whopping 1.04% of the CPI basket. "Information technology commodities" makes up a whopping 0.752%. Meanwhile the weights of essentials are: Food (13.507%), Energy (7.418%), Shelter (35.323%), Medical care services (6.834)
It's a statistical tool concerning populations, not a sampling of what hacker news user cicko in their wisdom thinks increases quality of life.
The quality of the house your grandparents (for 1920 probably your grand-gran parents) is vastly different. Those houses cannot be compared at all, when I take my dump in the heated warmth in a nicely smelling place listening to some music over my airpods.
That house trades at 13x now.
There is no house of any size for 3x in most areas of the UK.
You can’t handwave that away by saying “central heating”. The cost of part-of-a-house is far less than the total - not 10x more on top.
Part of the issue is population doubled since then but house building didn’t. Part is cheap debt in the 2000s turned everyone and their dog into buy-to-let landlords then AirBnB hosts.
Let's look at some real numbers instead of a folksy parable about grandma. Here are recent stats about rent arrears:
https://www.baselane.com/resources/unpaid-rent-debt-statisti...
And rental affordability:
In 2026, a full-time worker needs to earn $34.73 per hour to afford a modest two-bedroom rental home in the U.S. and $29.19 to afford a modest one-bedroom rental.
And mortgage affordability:
https://www.visualcapitalist.com/median-house-prices-vs-inco...
None of these are heading in the right direction.
Aside from technological and scientific progress in the medical field, it's generally been shown that people's lives have gotten worse.