Is Basic Income more expensive because income-unconditional?

Instead of resting on the fact that a basic income is paid to all, whether or not they show any willingness to work, the claim that a basic income is unaffordable invokes even more often the fact that it is paid to rich and poor alike. The discussion of the means test should have made plain that this allegation is wrong, misled as it is by too superficial a notion of cost. As the comparison of Fig.1 and Fig. 2 shows, it is in principle possible to achieve with a basic income exactly the same relationship between gross and net income as with a conventional guaranteed minimum income. If this relationship is the same, it means that the cost to those taxpayers who net contributors to the scheme is the same in both cases. If one is politically affordable, therefore, the other should be too. If the relationship is the same, it also means that the marginal tax on earnings at any level of earnings is the same in both cases. If one of the two schemes is economically affordable, therefore, the other should be too.