Source
When this applies
when a founder-era decision calcifies into an unquestioned organizational 'religion' long after the environment that justified it has changed
The takeaway
When costs rise, prefer transparent price adjustments over disguised quantity/quality reductions, because consumers judge total perceived value (size, heft, satisfaction) more than unit price, and disguised erosion eventually surfaces and damages trust disproportionately.
Why it works
Hiding inflation by shrinking product size rather than raising price avoids short-term backlash but accumulates a hidden value-erosion that customers eventually notice all at once, causing a bigger trust rupture than incremental price increases would have.
One level up
Rules that made sense under founding conditions must be periodically re-examined, or they become dogma that actively destroys value as conditions change.
Where it stops holding
This stops working when customers truly cannot detect or don't care about quantity/size changes, or when the category has no competitor able to exploit the mismatch.
Detail
situation: Hershey kept its chocolate bar price at a nickel for nearly 70 years, managing inflation by repeatedly shrinking the bar size (from 1.25oz to half that) rather than raising price.
decision: In 1969 Hershey finally raised the price to a dime and simultaneously restored the original size, effectively doubling price and size at once rather than communicating incremental changes over time.
outcome: Consumers were outraged, feeling deceived about decades of hidden shrinkage; Mars (now making its own chocolate) responded with a price/size war, and by 1973 Mars overtook Hershey as America's top candy company.
lesson: Disguising cost increases through shrinkage rather than transparent pricing can erode trust catastrophically once revealed, and a rigid, un-rethought legacy pricing rule can become a competitive liability.
In their words
A, you just raised the price. You doubled the price. But B, you have just totally exposed that you have been gaming us for 70 years.