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This paper analyzes the causal impact of extensions using a natural experiment in Portugal that resulted in a sharp and unanticipated decline in the extension probability of agreements. Our results, based on a regression discontinuity design, indicate that extensions had a negative impact on employment growth. This effect is concentrated among nonaffiliated firms, which may reflect the limited representativeness of employer associations.<\/jats:p>","DOI":"10.2478\/izajole-2020-0005","type":"journal-article","created":{"date-parts":[[2020,8,28]],"date-time":"2020-08-28T10:42:17Z","timestamp":1598611337000},"source":"Crossref","is-referenced-by-count":12,"title":["No extension without representation? 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