Financial products and contracts as agents for long-term sustainable economic behaviour

Abstract This article is for environmental, social, governance and sustainable finance lawyers and makes a practical design claim in legal form: instruments change behaviour less at signature than in their second life, when they are transferred, reopened, refinanced, collateralized, and repackaged. Sustainability language that lives only in narrative disclosure or process commitments tends to decay in that second life because it does not reliably travel with the instrument as enforceable rights, repeatable evidence, and consequences. That decay is both an integrity risk and a value risk, as weak post-issuance enforceability increases diligence friction and uncertainty at the point of a secondary exit. The article proposes a second-life integrity test and an anticipatory second-life-by-design approach. Nature is treated as an infrastructure-like service: with measurable performance intervals, identifiable failure modes, and maintenance logic expressed as covenants, pricing mechanics, reserves, and remedies. Two contract architectures are set out: performance leases and real-asset contracts and ring-fenced vehicles with cash traps and reserves that keep maintenance funding from evaporating across refinancing cycles. A worked contracting example illustrates how a soil-water retention service can be specified, monitored, and paid for in a way that remains effective under assignment and ownership change.