In environments with expected utility, it has long been established that speculative trade cannot occur (Milgrom and Stokey), and that the value of public information is negative in economies with risk-sharing and no aggregate uncertainty (Hirshleifer, Schlee). We show that these results are...

The ability of markets to aggregate information through prices is examined in a dynamic environment with unawareness. We find that if all traders are able to minimally update their awareness when they observe a price that is counterfactual to their private information, they will eventually reach...

The COVID-19 pandemic has resulted in high fatality rates and widespread lockdowns, that countries aim to ease by deploying contact-tracing mobile apps, which notify individuals who were in close geographical proximity to positive cases. We suggest that a powerful tool to induce social...

We show that there cannot be common knowledge trade in a truly decentralised environment, such as in a blockchain. A trade is an agreement to buy and sell a security that pays according to some state of nature; it is settled when the security's value is verified by an oracle, an intermediary who...

We provide a syntactic model of unawareness. By introducing multiple knowledge modalities, one for each sub-language, we specifically model agents whose only mistake in reasoning (other than their unawareness) is to underestimate the knowledge of more aware agents. We show that the model is a...