The Union Advent: 10 Dec
They concluded that ‘trade unions continued to raise pay in the private sector … keeping it above the levels in comparable non-union workplaces’. The research also found that about 3 million employees in the private sector (a fifth of all employees) enjoy a pay premium of around 10% directly as a result of strong collective bargaining.
Source: The impact of trades unions on jobs and pay. Millward N, Forth J and Bryson A. June 2001. Joseph Rowntree Foundation