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The consumption function captures one of the key relationships in economics that was first developed by John Maynard Keynes.It expresses consumption as a function of disposable income, where disposable income is income after taxes.The table below shows the data for U.S. annual consumption and disposable income for the years 1985-2006.

disposable Year consumption income 1985 $23,490.00 $36,436.00 1986 $23,866.00 $36,696.00 1987 $24,414.00 $41,405.00 1988 $25,892.00 $49,336.00 1989 $27,810.00 $47,690.00 1990 $28,381.00 $36,127.00 1991 $29,614.00 $49,757.00 1992 $29,846.00 $47,314.00 1993 $30,692.00 $49,469.00 1994 $31,731.00 $33,208.00 1995 $32,264.00 $35,251.00 1996 $33,797.00 $48,633.00 1997 $34,819.00 $42,665.00 1998 $35,535.00 $55,914.00 1999 $36,995.00 $61,836.00 2000 $38,045.00 $66,345.00 2001 $39,518.00 $51,895.00 2002 $40,677.00 $60,798.00 2003 $40,817.00 $52,512.00 2004 $43,395.00 $63,055.00 2005 $46,409.00 $68,756.00 2006 $48,398.00 $72, 101.00