For the past 40 years Western economies have splurged on debt. Now, as the reality dawns that many debts cannot be repaid, we find ourselves again in crisis. But the oncoming defaults have a time-worn place in our economic history. As with the crises in the 1930s and 1970s, governments will fall, currencies will lose their value, and new systems will emerge.

Just as Britain set the terms of the international system in the 19th century, and America in the 20th century, a new system will be set by today's creditors in China and the Middle East. In the process, rich will be pitted against poor, young against old, public sector workers against taxpayers, and one country against another.

In Paper Promises, Economist columnist Philip Coggan helps us to understand the origins of this mess and how it will affect the new global economy, by explaining how our attitudes toward debt have changed throughout history, and how they may be about to change again.