'Prioritarianism is, broadly speaking, the ethical principle of decision-making in which we give extra weight to the needs of the most deprived. What makes Prioritarianism in Practice a valuable book is that it is a stocktaking of the philosophy and economics of prioritarianism and includes a series of chapters that show how these ideas can help us navigate the challenges we currently face - from health economics and policy, and climate change and interventions to combat inequality of opportunity, through the nature of education needed in this new world, to an excellent, topical chapter on Prioriarianism and the COVID-19 Pandemic. The book serves as a single source for the philosophy of prioritarianism and its real-world applications.' Kaushik Basu, Cornell University