The record wealth gap between whites and minorities is driven in part by how they invest in their 401(k)s, according to Stanford University researchers.

The researchers, Mark Cullen, Kai Kuan and Sepideh Modrek, came to that conclusion after looking under the hood of one 401(k) plan, examining the differences in savings and investment habits between white, African American and Hispanic co-workers over an eight-year period.

Typically, higher incomes, more and larger inheritances, and higher rates of home ownership all influence wealth accumulation. But past research on how savings and investing habits affect wealth has produced ambivalent data.

Aiming to get to the bottom of things, the Stanford academics tracked a group of workers that was continuously employed at the same firm between 2003 and 2010.

More than 9,500 participants’ accounts were examined, none of whom earned more than $200,000 in any given year. The workers spanned 29 U.S. locations. Three-quarters were hourly workers, and 83 percent were male. In terms of race, 83 percent were white, 8.3 percent African American, and 5.8 percent Hispanic.

At the end of the study period, the median 401(k) account balance was just over $52,500.

However, the median account balance for whites between 40 and 60 was near $90,000.

For Hispanics, the median balance was near $50,000, while for African Americans it was near $30,000.

Even younger whites, those ages 20 to 40, had median account balances that were higher than the middle-age African Americans.

The disparity is explained, in part, by much higher rates of non-participation among both African Americans and Hispanics, the researchers said.

When they do participate, Hispanics tend to defer equal amounts of income as whites. But the study showed African Americans contributed about 2 percent less of their income to the plan than whites.

Minorities were also only half as likely to invest in stocks as whites were, and twice as likely to invest in conservative money-market funds, clearly affecting returns on accounts, and ultimately balances.

And both Hispanics and African Americans drew down their 401(k) balances through withdrawals and loans at a higher rate than whites, with African Americans also withdrawing much more than Hispanics.

The paper attempts to speculate how financial literacy affects savings habits by separating data of salaried and hourly workers, a “crude” way of estimating financial literacy, admitted the researchers.

Nonetheless, salaried African Americans were still less likely to participate than salaried whites, whereas salaried Hispanics participated at rates similar to whites.

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Nick Thornton

Nick Thornton is a financial writer covering retirement and health care issues for BenefitsPRO and ALM Media. He greatly enjoys learning from the vast minds in the legal, academic, advisory and money management communities when covering the retirement space. He's also written on international marketing trends, financial institution risk management, defense and energy issues, the restaurant industry in New York City, surfing, cigars, rum, travel, and fishing. When not writing, he's pushing into some land or water.