Is Basic Income more expensive because strictly individual?

It cannot be denied that the lifting of the means test raises a genuine cost problem, not as such by virtue of the fact that the basic income is given to the rich as well as to the poor but because (part of) its point is to provide the poor with stronger material incentives. It is not the only genuine cost problem intrinsic to basic income proposals. Another directly stems from the fact that, unlike most existing guaranteed minimum income schemes, basic income is meant to be strictly individual. These schemes typically provide a lower level of income support to each of the two members of a couple than to a single person, especially when account is taken of the housing subsidy, sometimes administered as a separate benefit. Why? Obviously because it is cheaper per capita to share a house, durable goods (cooker, washing machine, car, bed?) and some services (child care) with one or more other people than to shoulder the cost individually. The cheapest way of covering a given definition of fundamental needs therefore involves tracking the household composition and modulating the per capita level of the income guarantee accordingly. Of course, the corollary of this household-conditionality is that economies of scale are discouraged, fake domiciles rewarded and hence checks on people’s living arrangements required. One of the blatant advantages of basic income is precisely that it would do away with all that. People who put up with each other and thereby make society save on accommodation and consumer durables would be entitled to the benefits of the economies of scale they generate. There would therefore also be no bonus for those pretending to live apart when they do not, and no need to check who lives where and with whom.