Household Working Capital and Inventory Management Returns

The study aims to deepen our understanding of how households manage non-financial assets—namely, inventories of consumer goods—and the returns they realize from doing so. Many households, particularly those with lower incomes, hold little to no financial wealth but maintain sizeable inventories for everyday consumption. These inventories, often invisible in traditional measures of household assets, may serve as an important role among households just as inventories do among firms. The authors posit that the liquid savings held by households—what they term household working capital, comprising cash and inventories—aren’t only precautionary buffers but strategic investments that yield tangible financial returns.

To rigorously assess household inventory as a wealth and return-generating mechanism, the authors utilize large-scale scanner data that tracks the universe of retail purchases for over 50,000 households per year. This allows them to estimate average household inventory levels—roughly $725 to $1,100—and model the net returns from investing in such working capital. They further develop a parsimonious economic model that captures two main channels of financial return: (i) bulk purchases that lower per-unit costs, and (ii) bundling purchases in larger shopping trips that reduce trip-related fixed costs—both facilitated by holding more working capital. The model explicitly accounts for inventory depreciation and the trade-off between shopping frequency and savings.

The findings are striking. At very low levels of inventory, households can earn marginal returns exceeding 100%, far outperforming typical stock market returns. Although marginal returns decline as inventory grows, average returns for a typical household in equilibrium remain about 50%, indicating substantial payoff from strategic inventory management. Importantly, inventory holdings constitute a larger share of household wealth for lower-income groups—often eclipsing their financial assets—thus magnifying the impact of these returns on their overall portfolio.

These inventory returns carry meaningful implications for household finance: for many low-wealth households, working capital and inventory management act as an alternative to investing in risky financial markets, providing a high-return and lower-barrier path to wealth accumulation. Moreover, inventory behavior and the resulting returns vary by household circumstances. Households facing high trip fixed costs—due to opportunity costs of time or geographic distance—tend to increase cash holdings and inventory to capitalize on bulk savings, indicating strategic portfolio allocation between liquid assets and consumption inventories.

The study underscores that household working capital—including inventories—is a materially valuable and under-measured asset class. It challenges conventional notions in household finance by revealing how everyday consumer goods inventories can yield high financial returns, particularly for less-wealthy households. The findings suggest that financial inclusion efforts might benefit from recognizing and supporting inventory-based asset accumulation strategies. Integrating household inventory metrics into broader financial advice and policy frameworks could help improve savings and wealth-building outcomes.

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