[thereisnospork]

>Initially, he means that a single self-sufficient person contributes 0 to the GDP

There is probably an argument that for accounting purposes a person should bill themselves at market costs for self-work. E.g. mowing the lawn, changing one's own oil, doing one's taxes -- all are economic activities with a value associated which is 'lost' in a traditional GDP calculation.

[hot_gril]

Yeah, if it were possible to do that, it'd make sense. Best people can do is mentally bill themselves for their time and factor that into personal decisions.