
Autonomous consumption represents consumption when income is zero. In estimation, this is usually assumed to be positive. The marginal propensity to consume (MPC), on the other hand measures the rate at which consumption is changing when income is changing. In a geometric fashion, the MPC is actually the slope of the consumption function. The MPC ...
Found on
http://en.wikipedia.org/wiki/Consumption_function

The function relating aggregate consumption to aggregate income and sometimes other variables such as wealth.
Found on
http://www-personal.umich.edu/~alandear/glossary/c.html

in economics, the relationship between consumer spending and the various factors determining it. At the household or family level, these factors may ... [4 related articles]
Found on
http://www.britannica.com/eb/a-z/c/133

A graph showing how much will be spent by households at different income levels.
Found on
http://www.encyclo.co.uk/local/20140
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