A vintage is the cohort of positions a fund or an institution originated within a defined period, typically a fund's inception year or a specific annual cycle, and it is the standard unit for comparing performance across an institution's own deployment history over time. Vintage comparisons in legal-asset finance carry a specific complication this platform's economics essays describe directly: an institution's first vintage carries real construction cost, building the model, the corpus, and the governance infrastructure that made pricing possible at all, that a mature vintage does not carry, and comparing an early vintage's returns against a mature vintage's returns using the same benchmark, without adjusting for the cost each vintage actually absorbed, produces a misleading comparison in both directions. It can make an early vintage look worse than its underlying risk-adjusted economics actually are, and it can make a mature vintage look better than its marginal decision-making deserves credit for. Institutions and limited partners evaluating vintage-over-vintage performance should ask specifically whether construction cost has been separated from marginal underwriting cost before drawing conclusions from the comparison, since the unadjusted comparison flatters neither vintage in a way that actually reflects the manager's underlying decision-making, and can mislead a limited partner deciding whether to commit to the manager's next fund.
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