Economic Growth Is Ultimately Good for the Environment: Cross-Country Evidence

Princeton economists Gene Grossman and Alan Krueger produced a landmark study demonstrating that economic growth is ultimately good for the environment—a finding that challenged the prevailing assumption that prosperity and ecological health are fundamentally in conflict.

Their study covers four types of environmental indicators: urban air pollution, the oxygen regime in river basins, fecal contamination of river basins, and contamination of river basins by heavy metals. Drawing on cross-country data, they trace the relationship between income per capita and each indicator.

The pattern is consistent across indicators: economic growth brings an initial phase of environmental deterioration, followed by a subsequent phase of improvement. In other words, as countries develop from very low incomes, pollution tends to rise. But at some point—as living standards improve and citizens demand cleaner air and water, as governments gain capacity to regulate, and as the economy shifts toward services—environmental conditions begin to recover.

The turning points for the different pollutants vary, but in most cases they come before a country reaches a per capita income of $8,000.

This relationship has since become known as the Environmental Kuznets Curve—named by analogy to Simon Kuznets’ earlier observation about income inequality following an inverted-U path during development.

The implication is direct: preventing growth in poor countries in the name of environmental protection is likely counterproductive. Countries that remain poor stay trapped on the wrong side of the turning point. Economic growth is not the enemy of environmental improvement; it is, over the long run, a precondition for it.

That said, the curve is not automatic. Institutional quality, regulatory capacity, and open political systems all affect whether and how quickly a country moves through the deterioration phase. Growth creates the conditions for environmental improvement; it does not guarantee it.