It was called "product market fit". Earliest mention was in 1972: https://books.google.com/ngrams/graph?content=product+market+fit&year_start=1800&year_end=2019

It was called "product market fit". Earliest mention was in 1972: https://books.google.com/ngrams/graph?content=product+market+fit&year_start=1800&year_end=2019&corpus=26&smoothing=3&direct_url=t1%3B%2Cproduct%20market%20fit%3B%2Cc0#t1%3B%2Cproduct%20market%20fit%3B%2Cc1 https://books.google.com/ngrams/graph?content=product+market...