The complexities of multipolarity, heightened global tensions, and increasing militarisation are reshaping the disarmament, arms control and non-proliferation landscape within the United Nations. This report examines these evolving dynamics, contextualising their historical importance and...

We develop a theory of conversations. Two agents with different interests take turns choosing the topic of the conversation. Talking about a single topic allows them to delve deeper, making the conversation more informative (or enjoyable). To capture this dynamic, we assume that the marginal...

We estimate Costa Rica’s peace dividend following the end of the civil war and the army’s abolition in 1949 with synthetic control. The country’s average per capita GDP growth increased from 1.42% to 2.28% between 1950-2010, relative to a counterfactual Costa Rica that did not take this...

We study a model of social learning in networks where the dynamics of beliefs are driven by conversations of dissonance-minimizing agents. Given their current beliefs, agents make statements, tune them to the statements of their associates, and then revise their beliefs. We characterize the...

The keynote address to the Open Source/Open Society Conference, delivered on 22 August 2016. The address introduces Sir Geoffrey Palmer and Dr Andrew Butler’s new book, A Constitution for Aotearoa New Zealand, and discusses the shortcomings of New Zealand’s unwritten constitution