The American Dream of your children being more successful than you are might be more attainable in other parts of the world than in the US.
The Organisation for Economic Co-operation and Development figured out how long it would take low-income families to get to their country's average income, based on intergenerational income elasticity. That is, it measured how much children's' incomes depended on their parents' incomes.
On average among the 30 countries studied by the OECD, it will take four to five generations of children from a low-income family — families part of the bottom 10% of income distribution — to reach the average income in their country, according to the OECD's report on social mobility in 2018. The US is on par with that average, taking five generations for someone born into a low-income family to reach the nation's average income.
One of the findings from the OECD's report is that social mobility for earnings, education, and occupation is high in most Nordic countries. In many of those countries, it would take fewer generations for a low-income family to reach their country's average income.
These statistics are similar to findings in a 2018 report on economic mobility from the World Bank, which found that there are lots of high-income countries where the American Dream is more attainable than in the US.
Income inequality plays an important factor in intergenerational income mobility. The report said low-income families in low-inequality and high-mobility countries would take almost four generations to reach the average income. In contrast, high-inequality and low-mobility countries, which are typically emerging economies, take at least nine generations — double the average of countries part of the OECD.
Interestingly, no countries had both high inequality and high mobility. This correlation between inequality and mobility has been noted as the "Great Gatsby Curve", and it shows another pernicious effect of inequality.
The following chart shows all the countries included in the report and their intergenerational income mobility.
Here are the 12 countries in the OECD study where it would take fewer generations for someone born in a low-income family to reach their country's average income than someone born into a low-income family in the US to reach the nation's average income, ranked from the shortest to the longest length of time.
The most recent available data for the Gini coefficient, a standard measure of income inequality in a country, is used to separate ties in the ranking, where 0 equals complete equality and 1 equals complete inequality. Figures come from the OECD, and represent years between 2014 and 2017.
