John Maynard Keynes created the consumption formula to show the relationship between disposable income and the total amount consumers spend. The formula is C = A + MD. That is to say, C (consumer spending) equals A (autonomous consumption) added to the product of M (marginal propensity to consume) and D (true disposable income). Keynes' formula is a staple in consumer economics.
Determine which of your regularly-scheduled bills are essential. These are bills that would need to be paid even if you were unemployed, such as rent, utilities and groceries. Do not include non-essential bills for things like cell phones, life insurance or medical insurance.
Determine the minimum amount you can pay towards these bills.
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For instance, if you conversed water and electricity, determine the smallest utility bills you could receive. If you bought smaller amounts of less-expensive food, determine the smallest groceries bill you would need to pay.
Add these minimum, essential bills together. This is your autonomous consumption--the minimum amount of consumption that would continue to exist even if you were unemployed.