Answers are grounded in this paper and cite their sources.
G. St. J. Perrott, Selwyn D. Collins, Relation of Sickness to Income and Income Change in 10 Surveyed Communities: Health and Depression Studies No. 1: Method of Study and General Results for Each Locality, Public Health Reports (1896-1970), Vol. 50, No. 18 (May 3, 1935), pp. 595-622
No takes yet. Share an insight, caveat, or question.
Perrott et al. (1935) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: