When the American billionaire Robert Smith announced to students graduating from historically black Morehouse College that he would pay off their student loans, he put himself at the center of one of the 2020 US election’s key issues. While the cost of Smith’s surprise gift announced on Saturday to Morehouse’s 396-strong class of 2019 is not yet known, the body’s student debt is thought to reach $40 million. Smith, a Texas businessman who is the wealthiest African-American, has been applauded for his generosity, but his gift also generated jealousy among the many Americans struggling with huge student debts. “Can a billionaire pledge to pay off my student loan debt? I’m glad for the graduating class, but also envious,” one Twitter user wrote, reflecting a sentiment common on social media. Already, several Democratic challengers to President Donald Trump in next year’s elections have proposed ways to reduce the nearly $1.5 trillion American student loan burden, and even politicians who aren’t running have weighed in. “People shouldn’t be in a situation where they depend on a stranger’s enormous act of charity for this kind of liberation to begin with,” tweeted Alexandria Ocasio-Cortez, a rising Democratic House representative who was elected last year in part on the promise of free university education. Mobilized billionaires More than two-thirds of American graduates were in debt in 2016, the Institute for College Access and Success said in April, with their burden averaging $29,650. Paying off the debt often weighs heavily on young Americans’ lives through their 20s and 30s, delaying the starting of families and the purchase of cars and homes. All of that affects the US economy, and Smith isn’t the first billionaire to take notice. Last November, former New York mayor Michael Bloomberg pledged $1.8 billion to Johns Hopkins University in Baltimore, from which he graduated in 1964. The donation aims to make education at the elite school more affordable to low- and middle-income students, who would otherwise have to face fees and living costs totaling about $72,000 per-year. Another billionaire, Kenneth Langone, gave $100 million to the New York University School of Medicine last year to make tuition free for its current and future students.