Grit: The Power of Passion and Perseverance · chapter 3 · id grit-c3-05-duckworth-argues-that-effort-h

“Duckworth argues that effort has a multiplicative rather than additive relationship with talent, meaning even small amounts of additional effort have outsized effects on achievement.”

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CNBC - Duckworth formula for successsource alive

Achievement = talent x effort squared. This means effort has a multiplicative, not additive, relationship with outcomes.

Crede et al. (2017), JPSP meta-analysissource alive

Grit's overall correlation with performance outcomes was moderate (rho = .18), not the outsized effect that a multiplicative model would predict.

Polderman et al. (2015), Nature Genetics - meta-analysis of heritabilitysource alive

Personality traits including conscientiousness show approximately 40-50% heritability, placing a genetic constraint on how much effort can compensate for differences in baseline ability.

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