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This article introduces the Potential Payback Period (PPP) as an integrated valuation framework designed to reconcile the analytical divide between equity and fixed-income instruments. Unlike traditional metrics such as the P/E ratio, PPP accounts for earnings growth, discounting, and time, defining the period required for discounted earnings to equal the stock price. From this foundation, it derives four internally consistent return metrics: SIRR, SPARR, SIRRIPA, and SRP, which together decompose total shareholder return and enable direct comparison between stocks and bonds. A case study on NVIDIA illustrates the model’s flexibility, and practical applications are outlined for portfolio management and asset allocation. The PPP methodology offers a disciplined, risk-adjusted lens for evaluating investments across asset classes.