Is Permanent Income Permanent?
People often wonder if permanent income, a key idea in economics, stays fixed forever. The answer is no. Permanent income is not truly permanent. It refers to the steady, long-term average income a person expects based on their skills, job prospects, and career path. This expected income shapes how much they spend on a regular basis.
Economist Milton Friedman came up with the permanent income hypothesis in the 1950s. He said folks base their spending on this long-run income view, not just what they earn right now. For example, a medical student might buy a nice phone today. They do this because they expect a high doctor salary later, even if their current cash is low. On the flip side, someone who thinks they might lose their job soon will cut back on spending and save more.[1]
This idea contrasts with older views like the absolute income hypothesis from John Maynard Keynes. That one says spending matches current income exactly. More cash in the bank today means more spending today. But Friedman’s theory explains why people smooth out their spending over time. They borrow or save to keep their lifestyle steady, no matter short-term ups and downs.[2]
Permanent income changes when life does. A promotion, new skills, or better education can raise it. Job loss, illness, or a weak economy can lower it. It is an estimate of future earnings, so it shifts with new information. Think of it like planning your budget around what you believe your career will bring over years, not one paycheck.[3]
In practice, this affects big things like government policies. Tax cuts might not boost spending much if people see them as temporary. They save the extra cash instead, waiting for their long-term income to guide decisions. Studies show the urge to spend extra drops as wealth grows, keeping habits stable.[2]
Real life adds twists. Economic moods or surprises can shake spending even if permanent income stays put. People might splurge or hold back based on news or feelings, not just steady expectations.[5]
Sources
https://testbook.com/ugc-net-economics/consumption-function
https://www.britannica.com/money/consumption-function
https://economictimes.com/news/international/us/wealth-quote-of-the-day-milton-friedman-one-of-the-great-mistakes-is-to-judge-policies-and-programs-by-their-intentions-rather-than-their-results-what-is-friedmans-permanent-income-hypothesis/articleshow/126205015.cms
https://keyneseconomics.com/index.php/introduction
https://www.revistasice.com/index.php/CICE/article/download/6516/6506
