I was curious and from further investigation I came across this article on hedonic adjustments which goes through several examples [0] The author explains that

I was curious and from further investigation I came across this article on hedonic adjustments which goes through several examples [0] The author explains that for all practical purposes hedonic adjustments only happen in one direction and they therefore discount the corresponding price increase in the underlying good. They are manually curated and suffer from bias of the estimators. For example when airline baggage fees were added separate from ticket prices, there was no hedonic adjustment. However hedonic adjustment is used to discount the increase in the price of Honda Accords over time. The article was previously posted on HN with a healthy discussion that came to the same conclusion. [1] [0] https://www.epsilontheory.com/im-trying-to-understand-hedonic-adjustments/ https://www.epsilontheory.com/im-trying-to-understand-hedoni... [1] https://news.ycombinator.com/item?id=27114135 https://news.ycombinator.com/item?id=27114135