Obviously, the kind of thing I speculate on above is an industry-by-industry effect.
However, as mentioned in the article, the average house that is built today is larger than a house built in 1960 and that can account for some of the increase also.
Moreover, a 3x increase in one cost factor is a good start on explaining a 10x increase in overall costs. You can't expect any economic process, from grocery bills upwards, to yield an exactly proportional result between two "back of the envelope" estimates, now can you? One inflation estimator might not be akin to another etc, etc.
However, as mentioned in the article, the average house that is built today is larger than a house built in 1960 and that can account for some of the increase also.
Moreover, a 3x increase in one cost factor is a good start on explaining a 10x increase in overall costs. You can't expect any economic process, from grocery bills upwards, to yield an exactly proportional result between two "back of the envelope" estimates, now can you? One inflation estimator might not be akin to another etc, etc.