While Democratic presidential candidate Bernie Sanders has garnered populist support with his debt-free college proposal, several economists recently told NPR's "Planet Money" that they don't like the plan.

Their main gripe: The plan should target students who actually need free tuition rather than spend money to pay for everybody's public education.

Still, Sanders has pointed to free tuition in European countries like Germany and Denmark to prove the models can be successful.

"Free" is a relative term since tax payers absorb that cost.

European countries often differ greatly from the US in substantive ways. Their college enrollment percentages, for example, are much lower than in America.

Europe also traditionally has higher taxes than the US, which allows those countries to offer additional social services.

The Organisation for Economic Co-operation and Development (OECD) released its 2015 report on the tax burden on earnings among member countries.

Their report ranks countries by their tax wedge percentage. The tax wedge is the dollar measure of the income tax rate. The countries below with the red arrows offer free college, with the exception of the US. There are other European countries that offer free college, but the countries below are the most well-known examples.

View photos OECD comparison of total tax wedge as % of labor costs. More

While the tax wedge is certainly not driven solely by free-college tuition costs, the countries that offer this benefit have much higher income tax rates than the US. If the US were to go the route of European countries that finance free college by taxing the income of citizens, the tax wedge of 31.5% would likely increase.

Germany, with particularly high income taxes, has one of the most inclusive debt-free college programs, offering free college to foreign students as well.

European countries also differ substantively from the US in terms of the percentage of college attendees that their debt free models serve.

"Germany has a lower percentage of students go on to college than we have here in the US," Mark Huelsman, a senior policy analyst at think tank Demos, told ATTN.

The World Bank reports tertiary school enrollment by country, and the data supports Huelsman's claim. The World Bank defines tertiary school broadly, and includes universities, colleges, technical training institutes, community colleges, nursing schools, and research laboratories.

In 2012, the tertiary enrollment for European countries that offer debt free college, and the US, was as follows:

View photos Tertiary school enrollment More

The percentage is calculated by taking tertiary enrollment as a percentage of the total population of students who graduated within the last five years. For all countries, with the exception of Finland, the US has a much higher percentage of students who have enrolled in post-high school education.

While Sanders plans to fund free college by imposing a tax on "Wall Street speculators," free college in America would likely be a more complicated endeavor than it is in Europe.

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