jones has also argued that certain sectors requiring very high quality work and with very low error-tolerance can only exist and thrive given access to a high-iq population, because in such sectors, it is not possible to replace a single high-iq worker by multiple low-iq workers and achieve the same output. jones informally dubs such sectors "o-ring sectors" in contrast to "foolproof sectors" where a larger workforce of people with lower productivity can produce the same output as a smaller workforce of people with high productivity.