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 Jan 1960. fertility_rate, productivity · read from cache, latest-revised.
- Total Fertility Rate
Births the average woman would have over her lifetime.
Births the average woman would have over her lifetime at current age-specific rates.
- 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 →