Bugs are more like viruses in practice. The cost is useful to measure in negative lifespan, not cost to fix, per se. This is why many bugs are never fixed. Thos

Bugs are more like viruses in practice. The cost is useful to measure in negative lifespan, not cost to fix, per se. This is why many bugs are never fixed. Those cost nothing to fix, because they don't have to be. > Did your sql migration just delete all records in the production database? That's closer to 100x more expensive to fix in production. Companies that do this often, don't stay in business. It's not 100x more expensive if you're not in business. Survivorship ensures that classes of bugs don't have a consistent negative return, because they are often fatal.