availability bias — making decisions on the basis of more recent and more accessible information loss aversion — the strong preference to avoid a loss rather than to make an equivalent gain selective cognition — taking on board facts and arguments that fit with our existing frames risk bias — underestimating the likelihood of extreme events, while overestimating our ability to cope with them.

global greenhouse gas emissions is highly skewed: the top 10 percent of emitters — think of them as the global carbonistas living on every continent — generate around 45 percent of global emissions, while the bottom 50 percent of people contribute only 13 percent.

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What kind of currency, then, could be aligned with the living world so that it promoted regenerative investments rather than pursuing endless accumulation? One possibility is a currency bearing demurrage, a small fee incurred for holding money, so that it tends to lose rather than gain in value the longer it is held. The fact that demurrage is an unfamiliar term shows how accustomed we are to the ever-rising financial escalator that we ride – like knowing the idea of ‘up’ but not ‘down’, ‘more’ but not ‘less’. But demurrage is a word worth knowing because it could just feature in the financial future.

Whether you consider yourself an economic veteran or novice, now is the time to uncover the economic graffiti that lingers in all of our minds and, if you don’t like what you find, scrub it out; or, better still, paint it over with new images that far better serve our needs and times. The rest of this book proposes seven ways to think like a twenty-first-century economist, revealing for each of those seven ways the spurious image that has occupied our minds, how it came to be so powerful, and the damaging influence it has had. But the time for mere critique is past, which is why the focus here is on creating new images that capture the essential principles to guide us now. The diagrams in this book aim to summarise that leap from old to new economic thinking. Taken together they set out – quite literally – a new big picture for the twenty-first-century economist. So here is a whirlwind tour of the ideas and images at the heart of Doughnut Economics. First, change the goal. For over 70 years economics has been fixated on GDP, or national output, as its primary measure of progress. That fixation has been used to justify extreme inequalities of income and wealth coupled with unprecedented destruction of the living world. For the twenty-first century a far bigger goal is needed: meeting the human rights of every person within the means of our life-giving planet. And that goal is encapsulated in the concept of the Doughnut. The challenge now is to create economies – local to global – that help to bring all of humanity into the Doughnut’s safe and just space. Instead of pursuing ever-increasing GDP, it is time to discover how to thrive in balance.

For over 70 years economics has been fixated on GDP, or national output, as its primary measure of progress. That fixation has been used to justify extreme inequalities of income and wealth coupled with unprecedented destruction of the living world. For the twenty-first century a far bigger goal is needed: meeting the human rights of every person within the means of our life-giving planet.

cleaning up a nation’s air and water by shifting from manufacturing to service industries doesn’t eliminate those pollutants: it sends them overseas, letting someone else, somewhere else, feel the burn while those back home can import the neatly packaged finished product.

Worldwide, one person in nine does not have enough to eat.8 In 2015, six million children under the age of five died, more than half of those deaths due to easy-to-treat conditions such as diarrhoea and malaria.9 Two billion people live on less than $3 a day, and over 70 million young women and men are unable to find work.

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In the Togolese capital of Lomé, architect Sénamé Agbodjinou and colleagues set up Woelab in 2012, a ‘low-high tech’ workshop making its own design of open-source 3D printers using the component parts of defunct computers, printers and scanners that have been dumped in West Africa.

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In the words of the systems thinker John Sterman, ‘The most important assumptions of a model are not in the equations, but what’s not in them; not in the documentation, but unstated; not in the variables on the computer screen, but in the blank spaces around them’.

argues the evolutionary psychologist Gerd Gigerenzer: we have survived and thrived not despite our cognitive biases but because of them. These so-called biases are the underpinnings of our heuristics, the unconscious mental shortcuts we take every time we use a ‘rule of thumb’ to make decisions. Over millennia, the human brain has evolved to rely on quick decision-making tools in a fast-moving and uncertain world, and in many contexts those heuristics lead us to make better decisions than exact calculations would do.