Hopefully, thinking about society in this way allows us to better understand differences in economic performance. Social capital evolves over long periods of time, lives in the heads of those operating within society (but is often embodied in institutions, such as governments or firms), and influences economic behaviour. Some forms of social capital are growth compatible, others are not. In rich countries, norms and institutions encourage the clever application of new ideas to profitable ends, and innovators can take comfort in the belief that their efforts will be fairly judged in the market, and that any returns they earn will not be unjustly seized by others or the state.

[...] social capital can't easily be exported. [...] Social-capital-rich countries can merely try to create conditions that encourage the accumulation of healthy social capital in poorer countries. The European Union is a grand effort to do something very much along those lines: to create the incentives in peripheral European states with weaker social capital to invest in and deepen the sorts of social capital that are conducive to openness, the rule of law and free markets. International trade agreements and institutions such as the World Trade Organization are another way in which states actively seek to nurture social-capital deepening in poorer countries. Countries constantly use the geopolitical leverage available to them to try to improve the behaviour of troublesome neighbours, and these efforts occasionally bear fruit. Yet we should also acknowledge that countries are not, on the whole, very good at encouraging social-capital accumulation in others.