We study the effects of recruitment and screening methods on worker performance. If high-performance recruitment and screening systems exist, bundles of recruitment and screening methods would produce synergistic effects, increasing worker performance by more than the sum of the individual effects. An alternative hypothesis is one of diminishing returns, according to which adding a second method to an existing one produces a positive, but diminishing, effect on performance. Both hypotheses are definitively rejected by the data.
Available at: http://works.bepress.com/gary_fields/25/