Featherbedding is considered economically efficient because it occurs in the give-and-take of collective bargaining. If employers were relatively strong vis-a-vis unions, unions would be unable to impose featherbedding on them. As the politico-socio-economic strength of each party changes over time, collective bargaining outcomes will as well, enlarging or reducing the number and impact of featherbedding rules on the employer.[2][3][11][12]