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Tuition-free college has gotten a lot of momentum of late.

Front-runners in the Democratic presidential field—including , and – have all come out in support of federally funded tuition-free college.

And it isn't just Democrats. have passed tuition-free college policies, including Republican strongholds Tennessee, Arkansas and Kentucky. So have .

But there is about . Should there be an income cap, for instance, so that only poor or middle-income families are eligible? Should there be a minimum high school GPA requirement?

In my , I found that Americans view tuition-free college more positively when it's open to everyone—compared to when it is reserved for families who make US$50,000 or less. I also found that the public is more likely to support tuition-free college when it includes a 2.0 minimum high school GPA requirement, or basically a C average.

Affordability matters

How the public views tuition-free college matters because colleges are widely seen as . Yet, college , and .

Policymakers and scholars often differ on the best way to design tuition-free college. Some argue that is the most important consideration. Others stress the need for government to be able .

I believe that my research, along with , is the first to dig into what the American voters actually think about different versions of tuition-free college. And my project, in particular, is the first to speculate as to why.

In my study, I surveyed a nationally representative sample of 2,500 Americans in 2017 regarding tuition-free college. Overall, the majority of Republicans (65%) and Democrats/independents (74%) support the idea of tuition-free college. But when asked to consider different versions of tuition-free college, people's views start to shift.

For instance, when a family income limit is included, respondents were 3.3 percentage points less likely to view the policy as fair, compared to tuition-free college that is open to all students regardless of family income. However, if a 2.0 minimum high school GPA is required to be eligible for tuition-free college, respondents were 6.5 percentage points more likely to view the policy as fair, when compared to tuition-free college that is open to all students regardless of high school GPA.

So why are there these differences in the level of support? I argue that people are evaluating the target population. Research shows that policymakers and the public are benefits to groups that are powerful and considered deserving.

Making tuition-free college available to everyone may be to politicians catering to middle-class and high-income voters—two groups that are . But when tuition-free college is made available for everyone, it is and because when tuition-free college is universal, it gives money to families that could have afforded college anyway. For instance, in Oregon, of the $10.9 million in 2016 for the Oregon Promise—the state's free community college program—went to students in the highest two income brackets, while students in the lowest two income brackets only used about 17% of the funds. The middle income bracket used about 23% of the funds.

Merit-based policies may be more popular because students who make at least a C average in high school are seen as as more deserving. However, by supporting a C average minimum threshold, these policies also .

The critical challenge for policymakers, as I see it, is: How do you design a tuition-free college plan that is perceived as fair, that helps those who need it most and that government can actually afford?

This article is republished from under a Creative Commons license. Read the .