(National Academy of Sciences, 2025-05-02) Alonso-Paulí, Eduard; Balart, Pau; Ezquerra, Lara; Hernández Arenaz, Íñigo; Economía; Ekonomia; Institute for Advanced Research in Business and Economics - INARBE
Through a field study (N = 1,519) that uses a technology to record real-time data on waste sorting, we find that offering the opportunity to sign a pledge increases the effectiveness of an environmental campaign. With a timespan of over four years, the pledge increased waste sorting participation by 4.55 to 5.10 percentage points (SD = 0.1997). The effect is greater immediately after the campaign (around 9 to 10 pp during the first 15 wk), but it remains sizable and statistically significant 150 to 210 wk after signing (3.11 to 4.45 pp).
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