When Cooperation Extends the Shadow of the Future
SSRN working paper, October 2026
An indefinitely repeated prisoner’s dilemma in which the continuation probability depends on how many players cooperate. A 2×2 laboratory experiment tests whether the payoff from mutual cooperation and the continuation probability it induces act as substitutes in sustaining cooperation.
I introduce an indefinitely repeated prisoner’s dilemma in which the continuation probability depends on how many players cooperate. Theoretically, the payoff from mutual cooperation and the continuation probability it induces act as substitutes in sustaining cooperative equilibria. I test this in a laboratory experiment with a 2×2 between-subjects design that independently varies these two parameters. Three results emerge. First, an increase in the continuation probability associated with joint cooperation promotes cooperation only when it makes cooperation sustainable in equilibrium. Second, early in the experiment, payoff incentives raise cooperation more than theoretically equivalent continuation incentives; this asymmetry disappears with experience. Third, estimated strategies display substitutability between the two forces once treatments are matched on strategic uncertainty.
Ownership, Asymmetric Information, and Quality of Care for the Elderly: Evidence From US Nursing Homes During the COVID-19 Pandemic
with Michael Alexeev and Leonid Polishchuk
SSRN working paper, August 2024
Theory and evidence on how greater observability of quality narrows the care gap between nonprofit and for-profit providers, using US nursing homes during the COVID-19 pandemic as a natural test.
A common cause of market failures is asymmetric information. For this reason, the reliance on market incentives and signals requires that quality of goods and services is properly observable and verifiable. This requirement is hard to meet in the case of credence goods, including most social services. In such environment, nonprofit providers can offer additional quality assurance compared to for-profit entities. When quality becomes better observable and verifiable, and hence could earn a market premium, market incentives are closer aligned with social welfare, and the quality gap expected between nonprofit and for-profit provision is likely to narrow. We explore this conjecture theoretically and empirically, using in the empirical part the case of US nursing homes during the COVID-19 pandemic. The pandemic supplied new tangible and publicly observable nursing home performance measures such as infection and death rates among residents. These measures could serve as care quality indicators, revealing aspects and attributes of the nursing home care that remained hidden before the pandemic. The data reveal significant initial gaps between for-profit and nonprofit nursing homes in COVID-19 infection rates. However, in the ensuing catching-up process triggered by increased transparency, these gaps steadily declined, eventually leading to statistical parity between two types of ownership. We explore the role of local market structure in the adjustment of nursing home industry to the pandemic; retroactively evaluate the reliability of the official ranking system in predicting nursing homes’ performance; and look for evidence of sustainable learning-by-doing effect of the pandemic.