Complementary-Goods

Peanut butter and jelly are complementary goods, as are cars and gasoline, newer cars and electricity, electricity and basically everything else. We don’t normally think of, say, Docker and Kubernetes as complementary goods in software engineering, because you can get both for the low price of free. Or can you? You still have to invest time in learning both, and as the famous saying goes… Say it takes X hours to learn Docker adequately....