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This rewarding epidemiological study addressed itself to the known greater incidence of schizophrenic disorder among lower socioeconomic status (SES) individuals. The authors tested two hypotheses: 1, the 'downward drift hypothesis' which asserts that the higher rate of low SES people among the disturbed population is a consequence of these individuals' psychopathology; 2, the 'broad or intergenerational downward drift hypothesis' which asserts that the genetic diathesis to a mental illness with consequent social incompetence