The proponents of this theory consider that the labor market is divided into two non-competing sectors, which are primary and secondary. Work in the primary sector is characterized by relatively high pay, stable employment, quality working conditions and good career prospects. It is generally closed to external competition or very limited by qualifications, men being the majority in this sector. (Gurjao, 2015). Work in the secondary sector, on the other hand, is linked to low pay levels, a lack of stable employment and career prospects, and poor working conditions. Women in unstable part-time jobs predominate in this market, where employment is often non-permanent and unreliable, and employers avoid investing resources, fearing they will not get their money back.