It leads to inconsistent object states. Frame the concept in practical terms so you can explain it during interview discussion.
Failing to enforce invariants can result in objects entering invalid states, causing unpredictable behavior or system failures. In an e-commerce application, if a `Product` class does not enforce a positive price invariant, transactions might process with negative prices, leading to revenue loss or accounting errors.
Additional Notes
Why can not enforcing invariants become a real problem?