Complete loss of the original subset of affixes combined with a development towards allomorphy and new morphology is associated in particular with creolization, i.e. the formation of pidgins and creole languages.
For example, the modern Romance languages all continue to feature a complex verb system, while having strongly deflected their nouns, adjectives, and pronouns.
Specifically, the phenomenon occurs in the presence of large, influential groups of speakers that have acquired the leading idiom as a second language (L2)[5] and so is limited to economical trade-offs widely considered acceptable.
Important deflexion changes first arrived in the English language with the North Sea Germanic (Ingvaeonic) shifts, shared by Frisian and Low German dialects, such as merging accusative and dative cases into an objective case.
There are also a few cases of reversed directionality, e.g. in the evolution of the common Romance inflected future and conditional (or "indicative future-of-the-past") from earlier periphrastic suppletive forms for the loss of the corresponding classical Latin tenses.