The study is not trying to prove that worried people do worse on tests. That's well-established, not news to anyone. It's demonstrating that day-to-day financ

The study is not trying to prove that worried people do worse on tests. That's well-established, not news to anyone. It's demonstrating that day-to-day financial decisions like "should spend $1500 to repair my car?" produce enough worry in poor people to have a strong cognitive effect, wheras they don't have that effect on rich people.