"This article analyses national postal services unions' strategic capacity in Spain and Belgium in response to the effects of liberalization and changes in the postal sector. The analysis shows, first, that despite having had to operate in a hostile context, Correos and bpost unions have been able to mobilize their power resources to resist the impact of market pressures on employment and working conditions. Second, it detects the relevance of national industrial relations institutions in order to understand the strategies unions adopt."

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