

Pedestrians walk past a mall in Beijing on June 23. China’s manufacturing activity expanded in June for the first time this year as the effects of Beijing’s mini-stimulus on the world’s second-largest economy gradually kick in, financial firm HSBC reports. (Wang Zhao/ AFP/Getty Images)

There’s a lot of recent scholarship suggesting that non-democratic regimes grow faster than democratic regimes. This has led some people not only to admire the Chinese model of growth focused authoritarianism, but to suggest that it may be a better economic model for developing countries than democracy. However, this research tends to assume that both democracies and non-democracies are telling the truth about their growth rates, when they report them to multilateral organizations such as the World Bank. Is this assumption safe? The answer is no, according to a forthcoming article (temporarily ungated) by Christopher S. P. Magee and John A. Doces in International Studies Quarterly.

The problem that Magee and Doces tackle is that it’s hard to figure out when regimes are being honest or dishonest about their rates of economic growth, since it’s the regimes themselves that are compiling the statistics. It’s hard to measure how honest or dishonest they are, if all you have to go on are their own numbers. This means that researchers need to find some kind of independent indicator of economic growth, which governments will either be less inclined or unable to manipulate. Magee and Doces argue that one such indicator is satellite images of nighttime lights. As the economy grows, you may expect to see more lights at night (e.g. as cities expand etc). And indeed, research suggests that there’s a very strong correlation between economic growth and nighttime lights, meaning that the latter is a good indicator of the former. Furthermore, it’s an indicator that is unlikely to be manipulated by governments.

Magee and Doces look at the relationship between reported growth and nights at light and find a very clear pattern. The graph below shows this relationship for different countries – autocracies are the big red dots. Most of the dots are above the regression line, which means that most autocracies report higher growth levels to the World Bank than you’d expect given the intensity of lights at night. This suggests that they’re exaggerating their growth numbers.

The two countries with the biggest difference between their reported growth and their actual growth (as best as you can tell from the intensity of nighttime lights) are China (although the discrepancy was considerably larger in the mid-1990s than now) and Myanmar. More broadly:

if democracies report their GDP growth rates truthfully, then dictatorships overstate their yearly growth rate by about 1.5 percentage points on average. If democracies also overstate their true growth rates, then dictatorships exaggerate their yearly growth statistics by about 1.5 percentage points more than do democracies.

The authors conclude: