Debt == Sadness?

Aeon has a good short post about money and debt and the impact on our happiness or perceived levels of happiness. The summary is that it is best not to assume more debt than you can manage (obvious), but that incurring debt is not necessarily a reason to be sad. I have a hard time reconciling that as debt stresses me out whether it is manageable or not, but this may be good news for those with a stronger stomach for owing money to others.