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Americans made this absurd decision the last time gasoline prices crashed

standard chevron gas gasoline station
standard chevron gas gasoline station

(Flickr / Orange County Archives)
Fill it up with premium!

The last time oil prices crashed and brought down the price of gas, US consumers spent more money on gas.

In his latest book, "Misbehaving," behavioral economist Richard Thaler took a look at household budgets — among other things — and used them as a place to examine the book's core debate: the difference between "Humans" and "Econs."

Humans, in Thaler's book, are, well, normal people who sometimes do silly things, especially with their money.

Econs are calculating actors always seeking to maximize their "utility," or make the most of their time, money, and effort.

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For Thaler, economics classes (wrongly) teach that Econs are what people act like in real life; Humans, in contrast, are the people who actually exist.

And so on the question of what happens when gas prices plunge, Thaler cites a study from economists Justine Hastings and Jesse Shapiro that looked at what consumers actually did when gas prices fell 50% in the run-up to the financial crisis.

Households, Thaler found, typically have rigid "buckets" of spending — $80 per week on food, $100 on gas, $500 for a mortgage, and so on — and while a house of Econs would shift their spending around as the price of any one of these items rose or fell, Humans tend to stick to their buckets.

Richard Thaler
Richard Thaler

(Chatham House/Flickr)
Richard Thaler.

"The shift toward higher grades of gasoline was fourteen times greater than would be expected in a world in which money is treated as fungible," Thaler writes.

(Calling money "fungible" means it can be spent on anything: gas, stocks, clothes, whatever. Effectively, be earmarking these dollars for things like food, rent, etc., households disciplined themselves — though sometimes wrongly — by taking away this property from their money.)

Thaler adds:

"Further supporting the mental accounting interpretation of the results, the authors found that there was no tendency for families to upgrade the quality of two other items sold at the grocery stores, milk and orange-juice. This is not surprising, since the period in question was right at the beginning of the financial crisis of 2007, the event that had triggered the drop in gas prices. In those scary times, most families were trying to cut back on spending when they could. The one exception to that tendency was more splurging on upscale gasoline."

Fast forward to today, and you've got oil prices down about 50% from a year ago.

The thinking among most Wall Street economists as oil prices fell in late 2014 and into the early part of this year was that it would be a boon to US consumers. Retail sales, while they've improved, have certainly been lackluster.

And this time around, it seems that consumers have gone and saved some of the money they didn't have to spend at the pump, rather than spent it. So while saving seems like a smart choice for most people, for an Econ that had already budgeted to spend that money, this is the wrong decision.

fredgraph
fredgraph

(FRED)

But as Thaler emphasizes in his book time and again, our world is mostly full of Humans, not Econs.

Budgets are a good thing, Thaler writes, "But sometimes those budgets can lead to bad decision-making, such as deciding that the Great Recession is a good time to upgrade the kind of gasoline you put in your car."

Just something to keep in mind as Americans enjoy the lowest gas prices during Labor Day weekend since 2004.

NOW WATCH: Paul Krugman Explains Why There Are Two Kinds Of Economists And One Kind Is Wrong



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