सम्भूयसेतुबन्धादपक्रामतः कर्मकरबलीवर्दाः कर्म कुर्युः ॥ कZ_०२.०१.२२ ॥
sambhūya-setu-bandhād apakrāmataḥ karmakara-balīvardāḥ karma kuryuḥ
If someone withdraws after joining a collective setu-construction, his laborers and draught-oxen shall nevertheless perform the work (i.e., his contribution is enforced).
Free-riding in public goods: it deters strategic withdrawal by making the pledged contribution enforceable in kind.