Compare indicators
Each line rebased to 100 where the shared window begins — growth from a common base, not levels.
Each series rebased to 100 at Apr 1971. mortgage_30y, productivity · read from cache, latest-revised.
- 30-Year Mortgage Rate
The average rate on a 30-year fixed-rate mortgage.
Average rate on a 30-year fixed-rate mortgage in the United States (Freddie Mac survey).
- Labor Productivity
Output produced per hour worked, as an index.
Nonfarm business sector real output per hour of all persons, indexed to 2017=100.
Each measured on its own terms — compare the lenses, not just the lines. Full lessons → Learn
…and that proves nothing. Two lines moving together is not one moving the other. Almost any pair of trending economic series correlates highly — they share the same long climb of growth, prices, and population, or it is chance. r measures co-movement over this exact window, never cause. Change the range or swap a series and watch r move. Why correlation isn’t causation →