Gresham's Law
When currencies with different underlying values must circulate at the same official value, people have an incentive to spend the overvalued currency and retain the undervalued one. Broader applications are analogies about incentives.
THE IDEA
Gresham's Law
Gresham’s law describes how bad money can drive good money out of circulation when both are accepted at a fixed common value despite differing underlying values. People can spend the overvalued currency while retaining the undervalued currency. The exchange rule is essential to the explanation.
The idea can also serve as an analogy for systems that reward inferior work as much as, or more than, better work. For example, cutting corners may become attractive if it brings rewards without consequences. Whether the lower standard spreads depends on the incentives and constraints; it is not a universal law of competition.
Examine what the rules reward, what costs can be passed to others, and whether participants can distinguish quality.
When to use it
A regulator designing policies to prevent insurance companies from cherry-picking only the healthiest customers while dumping high-risk ones onto a public option.
A manager trying to maintain team integrity when a few members' toxic behavior seems to yield short-term results and goes unpunished.
A software engineer choosing between writing clean, maintainable code or quick, sloppy patches that meet deadlines but accumulate technical debt.
FROM THEORY TO EVERYDAY LIFE
In practice
Banking and Lending
During a credit boom, banks that issue risky loans with low standards can undercut conservative banks, forcing them to either lower their own standards or lose market share. Good lending practices are driven out by bad ones.
Workplace Ethics
If employees who cut corners or fudge results face no repercussions and get ahead, their behavior becomes the norm. Honest employees who refuse to compromise may become marginalized or leave, allowing bad morals to drive out good.
A MOMENT TO REFLECT
Put it to work.
In what situations are you tempted to keep the 'good' for yourself and pass off the 'bad'? What consequences (or lack thereof) enable this?
Can you identify a domain—professional, social, or personal—where you see lower standards displacing higher ones? What systemic changes could reverse the trend?
How could rules, incentives, or transparency make higher standards more attractive to maintain?
CONTINUE THE CONVERSATION
Source texts
- The Great Mental Models Volume 4 Economics and Art