Welfare isn’t just a moral imperative to raise the living standards of the poor. It’s also a critical investment in the health and future careers of low-income kids.

Take, for example, the striking finding from a new paper from researchers at Georgetown University and the University of Chicago. They analyzed a Mexican program called Prospera, the world’s first conditional cash-transfer system, which provides money to poor families on the condition that they send their children to school and stay up to date on vaccinations and doctors’ visits. In 2016, Prospera offered cash assistance to nearly 7 million Mexican households.

In the paper, researchers matched up data from Prospera with data about households’ incomes to analyze for the first time the program’s effect on children several decades after they started receiving benefits. The researchers found that the typical young person exposed to the program for seven years ultimately completed three more years of education and was 37 percent more likely to be employed. That’s not all: Young Prospera beneficiaries grew up to become adults who worked, on average, nine more hours each week than similarly poor children who weren’t enrolled in the program. They also earned higher hourly wages.

This finding has direct implications for the United States, where a core mission of the Republican Party is to reduce government aid to the poor, on the assumption that it makes them lazy. This attitude is supported by many conservative economists, who argue that government benefits implicitly reward poverty and thus encourage families to remain poor—the idea being that some adults might reject certain jobs or longer work hours because doing so would eliminate their eligibility for programs like Medicaid.

But this concern has little basis in reality. One of the latest studies on the subject found that Medicaid has “little if any” impact on employment or work hours. In research based in Canada and the U.S., the economist Ioana Marinescu at the University of Pennsylvania has found that even when basic-income programs do reduce working hours, adults don’t typically stay home to, say, play video games; instead, they often use the extra cash to go back to school or hold out for a more desirable job.

But the standard conservative critique of Medicaid and other welfare programs is wrong on another plane entirely. It fails to account for the conclusion of the Prospera research: Anti-poverty programs can work wonders for their youngest beneficiaries. It’s true north of the border, as well. American adults whose families had access to prenatal coverage under Medicaid have lower rates of obesity, higher rates of high-school graduation, and higher incomes as adults than those from similar households in states without Medicaid, according to a 2015 paper from the economists Sarah Miller and Laura R. Wherry. Another paper found that children covered by Medicaid expansions went on to earn higher wages and require less welfare assistance as adults.