"In this paper we use British Household Panel Survey data to examine the relationship between unionization and unpaid overtime in Britain. The findings indicate that in the for-profit, non-caring sector of the economy, union covered employees supply fewer unpaid overtime hours than noncovered ones due to union protection and the weakening of economic incentives caused by union bargaining. On the other hand, in the non-profit, caring sector, union members offer more unpaid extra hours than covered non-members because of their specific pro-social motivations. Additional evidence is presented that confirms that union members are actually characterized by a specific pro-social ethos."

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