"Back in the 1960s, the economist William Baumol observed that it took exactly as much labor to play a string quartet in 1965 as it did in 1865—in economics jargon, violinists hadn’t gotten any more productive. Yet the wages of a professional violinist in 1965 were a lot higher than in 1865."

This is actually brilliant and deep. We may argue a lot that music education became more expensive, violins themselves cost more, musicians should pay their rent, which is also increased century over century, but the fact stands still: it took exactly as much labor.

Talking about the rent: housing prices are driven by the average income (because the balanced market will extract maximum wealth from its participants). So the Baumol's cost disease can be one of the key inflation factors.