In a Representative Sample Grit Has a Negligible Effect on Educational and Economic Success Compared to Intelligence

We compare the relative contribution of grit and intelligence to educational and job-market success in a representative sample of the American population. We find that, in terms of ΔR², intelligence contributes 48–90 times more than grit to educational success and 13 times more to job-market success. Conscientiousness also contributes to success more than grit but only twice as much. We show that the reason our results differ from those of previous studies which showed that grit has a stronger effect on success is that these previous studies used nonrepresentative samples that were range restricted on intelligence. Our findings suggest that although grit has some effect on success, it is negligible compared to intelligence and perhaps also to other traditional predictors of success.