Growth Quality, Extrapolability, and the Valuation Trap of Involution

Persistent margin erosion and valuation stagnation frequently occur even as firms continue to grow in revenue and scale. Conventional explanations attribute this phenomenon to market mispricing, insufficient execution, or temporary competitive pressure. This paper argues instead that such outcomes reflect a structural problem: the deterioration of growth quality. We develop a structural interpretation of valuation metrics, arguing that price-to-earnings (P/E) and price-to-book (P/B) ratios function not as valuation formulas, but as market judgments about extrapolability—the plausibility that current earnings can be extended into the future without amplifying systemic risk or organizational fragility. We distinguish growth quantity from growth quality, and propose that low-quality growth is characterized by the erosion of replicability and strategic optionality, even as short-term performance improves. A critical concept introduced in this paper is “decline during growth”—a phase in which revenue and cash flow remain positive while growth acceleration weakens and structural constraints begin to surface. We argue that valuation compression during this phase is not a market failure, but a rational response to declining extrapolability. By reframing valuation as a structural judgment rather than a mechanical calculation, this paper provides a foundation for understanding involution as a predictable outcome of growth that undermines its own future. The analysis sets the stage for subsequent papers on governance transition and competitive dynamics under non-rational competition.