Argument: Progressive taxation is not necessarily good for employment
Clemens Fuest1 and Bernd Huber. "Is tax progression really good for employment?". Science Daily. 12 Jan. 2000 - "We show that the positive employment effect of tax progression can be generalized to a model with a positive labour supply elasticity of individual workers. However, the wage-moderating effect of tax progression does not unambiguously carry over to a world where the union may fix both wages and individual hours of work. In this framework, the union reacts to tax progression by cutting individual working time."