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In a new study, researchers were able to predict a person's economic status from their social network — the greater the number and diversity of connections, the greater the likelihood someone is wealthy.

What it means: Besides predicting economic status, author Hernan Makse said the data may indicate how a person is likely to react to issues and could be useful in maximizing the effects of large-scale economic stimulus policies. "For instance, the network of ties not only affect your economic status," Makse told Axios, "but also whether you are obese, you smoke, you are happy or you are married to the right person…The probability of all these events depends on your circle of influence."

The experiment: Makse and his team analyzed two datasets from Mexico: about 110 million phone calls across the country over three months and banking information from 500,000 people to determine their personal economic status (as measured by their credit card limit).

The results: Individuals in the top 1% of the economic stratum had a high location and influence in their social network compared with those in the bottom 10%.

Next step: The study better predicts economic status of older people than younger ones, so Ehsan Kazemi, a postdoctoral research fellow at Yale University who wasn't involved in the research, says they could follow up with the younger set in a few years to see if the economic prediction is correct.

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Biden releases 2019 tax returns ahead of debate

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Joe Biden's campaign released his 2019 tax returns on Tuesday, showing that he and his wife, Jill, paid nearly $300,000 in federal taxes last year.

Why it matters: The release, timed just hours before the first presidential debate, comes days after a bombshell New York Times report said that President Trump paid only $750 in federal taxes in 2016 and 2017. Biden's team is hoping to make the tax contrast a sticking point during their showdown.

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Illustration: Sarah Grillo/Axios

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NYC's coronavirus positivity rate spikes to highest since June

New York Mayor Bill de Blasio. Photo: Noam Galai/Getty Images

New York City's coronavirus positivity rate has ticked up to 3.25%, its highest since June, Mayor Bill de Blasio said at a news conference on Tuesday.

Why it matters: The jump — from 1.93% on Monday — came on the first day that public elementary classrooms reopened in the city after months of closures, but guidelines state that all public schools will have to shut if the citywide seven-day positivity rate stays above 3%.