I am not sure I fully understand your questions, Lars, but to answer your first and third questions, the most appropriate definition of household income depends on why you are making the comparison. (carnegieendowment.org)
Merriam - Webster Online gives these as appropriate definitions for consensus: 1. (realclimate.org)
But the more appropriate definition of subsidies is much larger (8 times larger than the pre-tax subsidies). (theguardian.com)