In 1968, Sveriges Riksbank (Sweden's central bank) established the Prize in Economic Sciences in Memory of Alfred Nobel, founder of the Nobel Prize. The Prize in Economic Sciences is awarded by the Royal Swedish Academy of Sciences, Stockholm, according to the same principles as for the Nobel Prizes that have been awarded since 1901. This volume is a collection of the Nobel lectures delivered by the Nobel laureates, together with their biographies and the presentation speeches, for the period 2016–2020.List of Nobel laureates and their award citations:(2016) Oliver Hart and Bengt Holmström "for their contributions to contract theory";(2017) Richard H Thaler "for his contributions to behavioural economics";(2018) William D Nordhaus "for integrating climate change into long-run macroeconomic analysis" and Paul M Romer "for integrating technological innovations into long-run macroeconomic analysis";(2019) Abhijit Banerjee, Esther Duflo and Michael Kremer "for their experimental approach to alleviating global poverty";(2020) Paul R Milgrom and Robert B Wilson "for improvements to auction theory and inventions of new auction formats";