Perennial Social Capital: A Fourth Capital Class Enabling Multi-Cycle Social Value Creation

This paper introduces Perennial Social Capital (PSC) as a fourth capital class alongside debt, equity, and grants. Existing capital forms fail to provide a mechanism that simultaneously (i) preserves principal, (ii) avoids balance-sheet liabilities, (iii) imposes no interest burden, and (iv) enables repeated redeployment of philanthropic funds across multiple cycles of social value creation. We formally define PSC as capital deployed with zero interest, soft repayability, and non-liability status, where recovered principal is recycled across multiple cycles at a rate R. We locate PSC against the nonprofit capital-structure literature, which has long diagnosed the absence of an equity-equivalent for mission-driven institutions but has answered it with frontloaded, single-cycle "builder" capital. We show that this equity gap is not a market failure but a direct entailment of the non-distribution constraint that defines the nonprofit form: equity requires a residual claimant, and the nonprofit form forbids one. PSC's central structural contribution is to reproduce equity's functional properties — patience, loss-absorption, balance-sheet strengthening, multi-cycle continuity — without creating a residual claimant, by confining recovery to principal alone. PSC is therefore equity-like in function and gift-like in law. We further distinguish two deployment modes: an institutional mode (PSC-F) for stable-counterparty settings, and a soft-counterparty mode (PSC-S) for domains of permanent non-collateralisability. A live deployment (the NABU literacy pilot) demonstrates that the recoverable instrument can be structured and deployed into a non-collateralisable position; recovery is scheduled but not yet realised, so no multi-cycle claim rests on it.