This article explains the process that is causing systems of teacher education in the EU, the USA and elsewhere to converge into a form of fewer qualitative distinctions. We argue that expansion brought about by processes familiar to globalisation is creating wide differences in the cost of information that incentivises use of standardised patterns for producing teachers. The logic of institutional expansion, like the logic of globalisation, operates as a uniting force across previously regarded nation-state boundaries and cultural distinctions. This brief study identifies institutional scale and the division of information as key factors that link the interaction of institutions across markets and adds insight into the critically important issues surrounding the production of quality teachers.