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# The science of buying a home

Marketplace Staff May 26, 2008
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# The science of buying a home

Marketplace Staff May 26, 2008
COPY

### TEXT OF COMMENTARY

Tess Vigeland: It’s clear from the real estate wreckage that a lot of homeowners asked for and got mortgages that they could not afford, but as anyone who’s been through the process will tell you, even with all the online calculators out there promising to figure out what your bank account can tolerate, it’s still something of a crap shoot.

Commentator Dan Ariely is in the market and this MIT professor doesn’t have any more of a clue than the rest of us.

Dan Ariely: My wife and I are currently house hunting, so we’ve been thinking about how difficult it is to calculate the optimal amount of money we should spend on a house and how much of it should we take as a mortgage.

To work this out, we need to take into account our current income, our expected future income, our predictions for the stock market and the housing market and the interest rate of mortgages today and in the future. On top of that, we need to consider the amount of happiness different houses will provide us and how will that level of happiness measure up against the lifetime costs of these homes.

41 years of education between us does not seem to be enough to figure this out.

Standard economics assumes that we’ll always act in a way that serves our best interest, but it’s very difficult for us to calculate what’s in our best interest in terms of home purchasing. So how can we be sure that our decisions will maximize our welfare? Calculating the right amount we should be spending and borrowing is so complex and banks don’t do much these days to help us determine how much we should borrow.

So what did we do? We realized that figuring this out rationally was a lost cause, so we relied on some simple but arbitrary factors. We picked a neighborhood that we liked a lot, we found the house that we liked the most within this neighborhood, then we offered to buy it for \$10,000 less than the asking price. I think that the owners of that house could have asked for \$100,000 more or \$100,000 less than their current price and we would have still offered them just a bit less than their asking price.

The problem is that we just have no idea how much this house is worth to us. We don’t know how to translate the pleasure we expect to get from it to the amount we are willing to pay for it and if the sellers accept our offer, we still have to decide how much to borrow and get a mortgage.

This ordeal is clearly not a rational decision-making process, but at least we are now closer to having a home.

Vigeland: Dan Ariely teaches behavioral economics at MIT. His new book is called “Predictably Irrational.”

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