Status quo bias
Etymology
"Status quo" is Latin for "the state in which" (things currently stand). "Bias," via Old French, means a slant or lean. So the term is a lean toward the existing state. Economists Samuelson and Zeckhauser documented it experimentally in 1988.
noun · /STAT-us kwoh BY-us/
A preference for keeping things as they are, treating the current state as the default even when change would help.
What it names
Why defaults are so powerful, why we stay on the wrong plan, and why "do nothing" quietly wins arguments it shouldn’t.
Example
Everyone agreed the old vendor was worse, but status quo bias kept the contract renewing year after year.
Related idea
The endowment effect (overvaluing what you already have) and default bias both push in the same direction.