Wages are the responsibility of the employer. The person who pays the wages is the employer. Therefore, you cannot say that the union or the workers are responsible for the wages that are paid. In proactive legislation, that work is done jointly. Why is it done jointly? In order to ensure that it is objective, valid and reflects the workplace. However, joint work does not mean joint responsibility. Responsibility is something different.
On May 14th, 2009. See this statement in context.