For microservice count N > 10, if your interdependence count k > 2.867N − 7.724, you are better off with a monolith. The assertion is based on a complexity metric, that has been correllated with cognitive and financial metrics. This came as an interesting side discovery when writing Kütt, Andres, and Laura Kask. "Measuring Complexity of Legislation. A Systems Engineering Approach." In International Congress on Information and Communication Technology, pp. 75-94. Singapore: Springer Singapore, 2020.