AbstractIn This Chapter5.1 How unemployed hairdressers became France’s mathematical champions5.2 Complexity: the Achilles heel of platforms5.3 The two functions of ecosystem architecture5.4 Ecosystem architecture5.5 Four desirable properties of platform architectures5.6 Modularity of architectures5.7 Goldilocks strikes again5.8 Two mechanisms for modularizationChapter summaryReferences