Equation 19 · Part 1 · Who Builds 2100? The Demographic Engine of Technological Evolution
Symbol g_S
What this part means
doing.
Its job in the formula
is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol g_S→Article meaning
Where the article explains it
If it does materialize, the difference between the top-right and bottom-right boxes — whether population is also growing or is instead the IHME-scale decline — matters much less than in the human-bound cases, because a large enough term dominates the sum in the numerator of the growth relation regardless of what is doing.
The passage around this formula
Put the two live disputes together — where the population lands, and whether research productivity keeps declining on its historical path or gets a machine-augmented boost — and the honest picture of 2100 is not one forecast but a small matrix of scenarios, each internally consistent, each resting on assumptions this article has tried to state rather than bury. Reading the table left to right along the top row: under the UN’s higher population trajectory and a continuation of Bloom, Jones, Van Reenen, and Webb’s documented historical pattern of declining human research productivity, the growth rate of ideas keeps decelerating, but more slowly than under any lower-population path, because a…
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A subscript is a label attached below a symbol. It often selects a time step, component, category, or member of a sequence.
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Sources cited in the surrounding passage
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