https://www.ons.gov.uk/employmentandlabourmarket/peopleinwork/earningsandworkinghours/articles/contractsthatdonotguaranteeaminimumnumberofhours/may2017
https://knowledge.wharton.upenn.edu/article/endowment-effect-trading-decisions-are-observable-in-the-eyes-of-buyers-and-sellers/
https://towardsdatascience.com/getting-started-in-r-markdown-2d3de636bde3