“…Building on the seminal work of Ostrom et al (1961), research points to polycentric systems as enabling greater efficiency and effectiveness with a redundancy that can mitigate risk, reduce institutional failure, and increase adaptive capacity (da Silveira and Richards 2013, Carlisle and Gruby 2017). Because polycentric systems are composed of many units operating at different scales, they can improve the "institutional fit" between natural resources and their management regimes, a relationship that can increase learning and enhance resource sustainability (Ostrom 1990, Ostrom 1999, Agrawal 2001, Young 2002, Agrawal 2003, Heikkila 2004, Imperial 2005, Folke et al 2007, Marshall 2009, Pahl-Wostl 2009, McGinnis and Walker 2010, Ostrom 2010, Schlager and Heikkila 2011, Aligica and Tarko 2012, Cole 2015, Carlisle and Gruby 2017, Pahl-Wostl 2017, Heikkila et al 2018, Özerol et al 2018, Cole et al 2019, Lubell and Morrison 2021, Baldwin et al 2023; G. R. Marshall, unpublished manuscript).…”