https://www.cps.org.uk/files/reports/original/201001000814-CPSUPWARDLYMOBILE2.pdf
https://www.taxpolicycenter.org/sites/default/files/publication/163549/report-taxing-business-incomes-evidence-from-the-survey-of-consumer-finances.pdf
http://www.bankofengland.co.uk/publications/Documents/fsr/2017/fsrjun17.pdf