Throughout history, Argentina has undergone a series of profound economic variations, which, as such, have produced a strong impact on labor legislation and social security. The access key in Argentina to labour law protection is the existence of a relationship of dependence. This turns to be an inclusive and exclusive condition because it divides strictly the labour market and the labour force inherent in two different areas, namely, the subordinate workers (who are included in the labour protection system) and the rest of the employees, including among the latest, the ones involved in non-typical forms of employment contracts. For such purposes, it is important to analyze different periods of time, selecting the more significant ones to see the evolution of Argentinean labour legislation. It is also relevant to describe the consequences caused by economic and political variations on collective bargaining in order to understand the composition of the actual labour force in Argentina.