This thesis examines the relationship between the institutions of language and markets. Specifically, it will analyse how the legislated language substitution from English to French impacted on Quebec's private sector. In particular, the thesis studies the impact of a specific language policy (Bill 101) on Quebec's segmented labour market. Ultimately, changes in initial conditions, arising out of the language switch could lead to Quebec's economy facing long-term growth significantly different to projected long-term growth prior to the legislative change. Thus the nature of the research, while specific in its study of the labour market, does not exclude the workings of other markets in the private sector that could impact upon the labour market. The results of the findings will indicate that language policies can, to a significant degree, alter the nature and composition of labour markets.