The relationship between economy and language is thought to be key to language revitalisation efforts, although the nature of the relationship is often discussed only in general terms. Royles sets out to address this ambiguity by defining the different dimensions of this relationship, however the resultant framework is based on a limited body of evidence. Using the case of Wales, we undertake a systematic review of what is known about the impact of economic variables upon language, thus generating a wider body of evidence to verify Royles’ framework. Our investigation reveals that of the 15,414 references generated as part of the review, 73 were found to satisfy the search criteria and all of which were successfully allocated within Royles’ categories. In validating Royles’ framework we advance a new understanding of economic impact on minority languages by moving from general to definitive terms and suggest that the clarity that this provides can be utilised by policy practitioners in their efforts to halt language decline.