The single greatest antidote to poverty and social stagnation is the emancipation of women. Wherever this has been tried, wherever women have been empowered to do as they wish, the economy and the culture have been radically improved.

A new book by Augusto Lopez-Claros, a senior fellow at the School of Foreign Service at Georgetown University, and Bahiyyih Nakhjavani, an Iranian writer and novelist, is among the first to comprehensively test this proposition by surveying data from 189 countries. Titled Equality for Women = Prosperity for All, the book shows how gender inequalities — in education, income, law, employment, and wages — lead to instability and chaos at almost every level of society.

I called Lopez-Claros to talk about the links between gender inequality and political instability, how discriminatory laws hold women back, and what we can do to push societies toward more gender equality.

A lightly edited transcript of our conversation follows.

Sean Illing

What happens to a society when women are deprived of their rights?

Augusto Lopez-Claros

One useful starting point to answer your question is to look at how discriminations are embedded in countries around the world — in constitutions, civil codes, family law, tax codes, labor codes, and every legal instrument that you can imagine having an impact on how the law treats women compared to men.

The World Bank did this for 189 countries, accounting for 98 percent of the global economic output, and we discovered that, as you might expect, discriminatory laws lead to highly unequal societies, especially in terms of income and employment and property ownership. They also discourage women from joining the labor force and from engaging in civil society, so you get not only unequal societies but also huge gaps in participation rates — in the job market, in politics, in education  of women relative to men.

This is terrible for social progress and for the economy, but one of the worst things this does is poison the future, because you get fewer women in school relative to boys and the effects of that spill into the next generation, and so you end up in this spiral of poverty and dysfunction that is hard to escape.

Sean Illing

Can you give me a sense of some of the more common forms of discrimination you found?

Augusto Lopez-Claros

Access to the labor market is huge. Many occupations are simply forbidden to women precisely because they’re women. In many places, you find that women have to obtain authorization from their husbands to obtain a bank account or even to travel. And then there’s the issue of property rights. Often the law treats women and men fundamentally different in terms of what they’re entitled to and on what basis.

Does the tax system provide benefits to men that it doesn’t provide to women? What about access to credit? In some countries, for instance, the law gives control of household assets to the man, and this very much restricts the ability of women to use the property as collateral to access the financial system.

These are the sorts of things we looked at, and we wanted to know how they impacted the societies in which we found them.

Sean Illing

Let’s talk about that. What is the direct link between gender inequality and political instability?

Augusto Lopez-Claros

The biggest impact of gender inequality is on income inequality. We have data that shows that countries that make it more difficult for women to access the labor market have higher levels of income inequality. And if you think about the intuition behind this, it makes sense. If you’re discriminating against half the population, how can that not worsen income inequality?

Political scientists have long understood how corrosive income inequality can be to political stability. There is pretty clear evidence that democracies with large gaps in income have a much higher probability of breakdown than those with a more egalitarian income distribution. So this gender inequality feeds directly into political instability.

Sean Illing

Does the data show that gender disparities disappear as societies become wealthier? Or that societies become wealthier as gender disparities disappear?

Augusto Lopez-Claros

The data suggests overwhelmingly that gender equalities lead to more wealth and less poverty, and of course, equal access to education is a huge component of that. More education leads to lower birthrates because women have more knowledge about family planning and more opportunities to enter the labor force and earn money.

Lower fertility levels help reduce child mortality, and they expand the range of educational opportunities that are available to the next generation. All of these factors combine to boost economic growth and higher income per capita.

On the other hand, to address the other half of your question, we have several examples of high-income countries, especially in the Middle East, that have very high levels of discrimination against women. So it doesn’t automatically follow that as countries become richer, all of a sudden, gender equality improves.

Read more at Vox