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Governments are confronted with crises that may spread beyond national borders and trigger significant economic knock-on effects. Managing crises is a key responsibility for governments, which have a crucial role to play to strengthen the resilience of their population, communities and critical infrastructure networks.

This paper provides a snapshot of the key findings of an Organisation for Economic Co-operation and Development (OECD) review of flood risk prevention policies in the Paris metropolitan area. With an innovative flood risk assessment, the study shows that a major flooding of the Seine River, similar to the flood disaster of 1910, could affect up to 5 million residents in the greater Paris area and cause up to 30 billion (109) euros worth of damage. Economic growth, jobs and public finances could also be significantly affected at the national level. The OECD Review on Flood Risk Management of the Seine River – commissioned by the basin organisation Seine Grands Lacs with the French Ministry of Ecology and Île-de-France regional council – recommends raising risk awareness among citizens and businesses, and improving the resilience of the metropolitan area to flood risks. Recent floods in Europe and New York City's Hurricane Sandy disaster in 2012 illustrated the vulnerability of today's ever-denser cities to flooding and the need to adapt critical infrastructure systems to be able to cope with extreme weather events. The OECD review suggests ways to minimise the risks and better prepare the Île-de-France region. It notes that proposed projects to develop and expand the city's transport and logistics networks offer an opportunity to put some of its suggestions into practice.

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In policymaking, we hear the word "system" all the time. The economic system. The education system. The financial system. The political system. The social system… However, we rarely hear the word system attached to the word "approach". But unless we adopt a systems approach, unless we employ systems thinking, we will fail to understand the world we are living in. Our world is made up of complex systems, systems of systems interacting with each other, and changing each other by that interaction and the links between them. The global economy now has a greater number of links than ever before. The global nature of supply chains; new ways of exchanging goods, services and ideas; increasing migration; and ever-greater digitalisation, all increase our global connectedness. Such interconnectedness, in turn, gives rise to complexity, and this can be good or bad. However, within mainstream economics, the understanding of why and when interconnectedness may increase stability or instability has remained fragmented. Complexity science helps us to understand the main features of the most important systems we have to deal with. Features such as emergence, when the overall effect of individuals' actions is qualitatively different from what each of the individuals is doing. Radical uncertainty is another important aspect. It describes surprises-outcomes or events that are unanticipated, that cannot be put into a probability distribution because they are outside our list of things that might occur. But despite radical uncertainty and the unanticipated, the future is born by anticipation. We take decisions and perform actions to influence the future, as individuals, societies or governments. And the imagined, probable, or expected outcomes influence our decisions and actions in the present. Even things that may never happen, or will only happen decades from now, can have an impact on what we do today. That is why we plan our day, buy insurance, and pay into pension funds. That is why we try to forecast everything from GDP to the weather to the results of elections or football matches. Of course, not all our decisions about the future are in tune with what economic rationality would like us to do. We promote evidence-based decision-making, but of course there is no evidence about the future. Moreover, experience shows that simply extrapolating from the past can be ridiculous, dangerous or at best misguided. A complexity approach helps us to avoid these errors. We are dealing with a world characterised by nonlinearities, tipping points, and asymmetrical relations where a small cause can have a big effect. In a systems approach, global issues need global solutions. Environmental problems do not respect borders. You need to import some goods and services to be able to export others. The digital revolution is making it hard to define what the "domestic" in "gross domestic product" is. Growing inequalities are creating discontent. If we are to tackle these issues, governments must change the ways in which they design and implement poli...