This is Part 4 of my on-going examination of the concept of ‘duty to work’ and how it was associated with the related idea of a ‘right to work’. In Part 3, I extended the analysis to the Western democracies of the Post World War 2 period and found that progressive political parties and movements firmly considered the two concepts to be fundamental elements of a progressive society. In this part, I extend that analysis and consider ways in which the ‘duty to work’ has been justified, drawing on the idea of reciprocity and social obligation. I also show how the emergence of neoliberalism has broken the nexus between the ‘right to work’ responsibilities that the state assumed in the social democratic period and the ‘duty to work’ responsibilities that are imposed on workers in return for income support. That break abandons the binding reciprocity that enriched our societies.