A key problem with Caplan’s trinity is that most of it is easily replaceable. Getting good grades at college does signal intelligence and conscientiousness, but these could be signaled far more easily and cheaply. It’s very easy to signal intelligence via test scores: IQ is surprisingly predictive of many other desirable cognitive traits. This need not require literal IQ tests—standardized tests like the SAT or GRE are highly correlated with intelligence.
Good luck not getting a disparate impact suit if you try this. You have to prove that the test that you’re using is necessary for the job. College is basically always considered necessary. The coding interviews you mention are obviously necessary. Trying to use an IQ-like test or even the SAT (unless you’re a college) will get you in court.
Good luck not getting a disparate impact suit if you try this. You have to prove that the test that you’re using is necessary for the job. College is basically always considered necessary. The coding interviews you mention are obviously necessary. Trying to use an IQ-like test or even the SAT (unless you’re a college) will get you in court.