Go read the whole thing. I’ve never faced the kind of financial black hole that would make such a default a good move for me, but I believe I’d make the same analysis the author has.

We normally say that a company “went bankrupt,” implying that it had no choice. But when, recently, American Airlines filed for bankruptcy, it did so deliberately. The airline had four billion dollars in the bank and could have kept paying its bills. But it has been losing money for a while, and its board decided that it was foolish to keep throwing good money after bad. Declaring bankruptcy will trim American’s debt load and allow it to break its union contracts, so that it can slim down and cut costs.

American wasn’t stigmatized for the move. Instead, analysts hailed it as “very smart.” It is now generally accepted that when it’s economically irrational for a company to keep paying its debts it will try to renegotiate them or, failing that, default. For creditors, that’s just the price of business. But when it comes to another set of borrowers the norms are very different. The bursting of the housing bubble has left millions of homeowners across the country owing more than their homes are worth. In some areas, well over half of mortgages are underwater, many so deeply that people owe forty or fifty per cent more than the value of their homes. In other words, a good percentage of Americans are in much the same position as American Airlines: they can still pay their debts, but doing so is like setting a pile of money on fire every month.

These people have no hope of ever making a return on their investment in their homes. So for many of them the rational solution would be a “strategic default”–walking away from the mortgage and letting the bank take the house. Yet the vast majority of underwater borrowers keep faithfully paying their mortgages; studies suggest that perhaps only a quarter of all foreclosures are strategic. Given how much housing prices have fallen, the question is why more people aren’t just walking away.