Symbol Δ I

The passage around this formula

where tasks are indexed by x , s(x) is the value-added share of task x , I is the automation frontier below which capital performs the task, N is the upper edge of the task space where new tasks appear, and $\eta$ scales the induced demand from higher output. The expression is illustrative of the structure rather than a reproduction of any published estimating equation; the substantive claim it encodes is that the sign of $\Delta$ $\ln$ L is not determined by the size of $\Delta$ I alone.

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