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The development of a new global health architecture in the wake of Covid-19 will require important decisions to be made, especially when it comes to negotiating a pandemic accord and creating robust supply chains. Against the backdrop of their systemic rivalry, the US and China view global...

Probabilistic risk beliefs are key drivers of economic and health decisions, but people are not always certain about their beliefs. We study these "imprecise probabilities", also known as ambiguous beliefs. We show that imprecision is measurable separately from the levels of risk beliefs. People...