If one needed evidence of the gross ignorance of millennials, and their teachers and college professors, it’s their solid support for socialism and socialist presidential candidate Sen. Bernie Sanders. Socialism has produced tragedy wherever it has been implemented. Last year marked the 40th anniversary of nearly 1,000 Americans perishing in a mass suicide/murder in the jungles of Guyana. Just as Sanders and Rep. Alexandria Ocasio-Cortez see socialism as mankind’s salvation, so, too, did Rev. Jim Jones, who told his followers, “God is Socialism, and I am Principle Socialism, and that’s what makes me God.”

Perhaps the most disastrous failing of our educational system and the news media is that people are neither required nor encouraged to test ideas against facts. The promises of socialism sound wonderful and caring, but in reality, wherever it has been tried it has been a true disaster. Let’s examine the history of socialism.

During the first three decades of the 20th century, Argentina was one of the world’s top-10 richest nations. It was ahead of Canada and Australia in total and per capita income. After Juan Peron’s ideas, captured in his economic creed that he called “national socialism,” became a part of Argentina’s life, the country fell into economic chaos. Today, it has fallen to 25th in terms of GDP.

Nicolas Maduro, an avowed socialist, has turned oil-rich Venezuela into a place where there are shortages of everything from toilet paper to beer, where electricity keeps shutting down, and where there are long lines of people hoping to get food. Some people are eating their pets and feeding their children from garbage bins. Socialism has crippled Venezuela’s once-thriving economy. Today, Venezuela is among the world’s most tragically poor countries.

Socialism can be tested by doing a few side-by-side country comparisons. After Germany’s defeat in WWII, it was divided into socialist East Germany and capitalist West Germany. West Germans had far greater income, wealth and human rights protections. In large numbers, East Germans tried to flee to West Germany, so much so that the East German government set up deadly mines and other traps to prevent escape. Few, if any, West Germans tried to flee to East Germany, and the West German government spent no resources preventing its citizens from leaving.

Then there’s North Korea and South Korea. North Korea’s nominal per capita GDP is only 3.6 percent of South Korea’s nominal per capita GDP of $23,838. There are few human rights protections for North Koreans. North Korea, like East Germany, has set up deadly mines and other traps to prevent its citizens from escaping.

The key features of a free market system are private property rights and private ownership of the means of production. By contrast, socialist systems feature severely limited private property rights and government ownership or control of the means of production.

There has never been a purely free market economic system, just as there has never been a purely socialist/communist system. Let’s do an experiment. First, rank countries according to whether they are closer to the free market or the communist end of the economic spectrum. Then, rank countries according to per capita gross domestic product. Finally, rank countries according to Freedom House’s “Freedom in the World” report.

Here’s our finding: People who live in countries closer to the free market end of the economic spectrum not only have far greater income and wealth than people who live in countries toward the communist end; they also enjoy far greater human rights protections. Moreover, it’s the socialist nations that have murdered tens of millions of their own citizens such as the case with the former USSR and China.

Sanders and other socialists hold Denmark as their dream, but Prime Minister Lars Lekke Rasmussen said: “I know that some people in the U.S. associate the Nordic model with some sort of socialism. Therefore I would like to make one thing clear. Denmark is far from a socialist planned economy. Denmark is a market economy.” Scandinavian socialism is a myth.

Walter E. Williams is a professor of economics at George Mason University.