Behavioral Economics, Episode #27

This week on Crash Course Economics was not so much…economics.  In this economist’s view, behavioral economics is more akin to psychology or sociology, despite having the “economics” in the name.  Nonetheless, we are going to talk about some of the points that Crash Course did make on economics in this weeks episode.

The Big Picture: Predicting Behavior


When economists make their models, they generally assume that people are rational and predictable.  But when we look at actual human beings, it turns out that people are impulsive, shortsighted, and, a lot of times, just plain irrational.

People often point to the existence of human irrational behavior to argue against economic truths that they might not like.  For example, if you are arguing through economic logic that price controls make an economy worse off, a position that economists from all sides of the spectrum agree with, you might hear a response like “well, that assumes that people are acting rationally in their own self-interest, or with perfect information, but that isn’t always the case.”

While this might be true (there isn’t always perfect information, and people aren’t always rational) it doesn’t disprove any economic theories.  What it does support, however, is that economics is very difficult to predict empirically.  Let’s look at an example from this week’s episode:


Some grocery stores in the Washington DC tried to decrease the use of disposable plastic bags by offering five cent bonuses if customers brought reusable bags.  The policy didn’t do that much. Later they tried a five-cent tax on plastic bags, and, this time, people used fewer disposable bags.

While empirical economists would be wrong in their predictions of the effects of the bag bonuses, those economists who shy away from empirical predictions (namely from the Austrian School) would only predict that there would be fewer plastic bags used than before, which is likely true.

In short, Crash Course’s big picture look at behavioral economics shows us how all those brilliant economists working for different government agencies and universities manage to get things wrong.  The problem is not the theory, but the empiricism.

Lack of Information


Classical economics assumes that consumers have perfect information when making choices. That is, they know or at least can quickly access information about prices and quality, but, in reality, they often don’t.  Sure, the consumer could ask around or call their friends to see if they’ve tried that type of ice cream but they’re probably not gonna do that. In this situation, consumers may act on the limited information they have, a suspiciously low price, which means either the ice cream is a great deal or it tastes like mayonnaise.

The way markets work is that the supply, demand, and price work out over time.  Consumers might be cautious to any product at first, but as more people try the product and share the information about it (whether it’s on cnet, yelp, or amazon), the market tends to work itself out, even when it’s a little rocky at first.  As Crash Course points out correctly, perfect information doesn’t happen all at once, but the market does move toward perfection as time goes on.  As for the ice cream example, if the ice cream had a suspiciously low price but tasted like high quality ice cream, over time demand would meet the market’s expectations, although it might not happen at first.  Ever heard of two buck chuck?


Crash Course talked about a fantastic and recent theory in behavioral economics called Nudge Theory.  Best explained in the book Nudge: Improving Decisions about Health, Wealth, and Happiness, Nudge Theory recommends an opt-out system of public policymaking, where the preferred choice is made easier or more visible to to the consumer, while still allowing the consumer to choose the less desired choice: