The Tangibility Premium: How Natural Resource Assets Unlock Debt Efficiency Across the Firm Life Cycle

Abstract

Natural resource reserves are widely seen as top-tier tangible assets, but whether they actually help the bottom line has long been unclear. This study investigates whether these reserves make borrowing cheaper by serving as reliable collateral. This effect is known as the “Tangibility Premium.” Using a global sample of 417 listed resource-intensive firms with 2,213 firm-year observations from 2000 to 2023, we employed firm fixed-effects regressions to control unobserved heterogeneity. The results are revealing that on their own, large resource holdings and high leverage both hurt net income, think exploration costs, depletion, and interest expenses. So, when these two are combined, something interesting happens like their interaction is strongly positive. In other words, resource tangibility turns debt from a burden into a powerful profit driver. The magnitude is far from trivial, a one-standard-deviation increase in the interaction lifts annual net income by roughly 12–18% of the sample average. This benefit, however, is not universal. It shows up clearly in the Growth and Maturity stages, when firms have the operational muscle to extract and monetize their reserves, but it completely vanishes in the Decline stage. The findings help explain why earlier studies on tangibility and leverage have produced such mixed results. They also suggest that, for resource firms, debt can serve as the “activation energy” that turns dormant underground assets into real earnings, and that the optimal capital structure changes dramatically over a firm’s life cycle.

JEL classification: G32, Q30, O13