What are some mind-blowing facts about social psychology?

This is more behavioral/consumer focused but has social implications...and it is mind-blowing.
Default Option

The chart above (from a study by Eric Johnson and Daniel Goldstein titled "Do defaults save lives?") shows the percentage of people in each country who consent to donate their organs.

What is interesting is that many of the countries in yellow on the left (Denmark, UK, etc.) are similar to many of the country in blue on the right (Belgium, Sweden, France, etc.) in terms of economics, development, etc. So why the staggering difference in consent to donate organs?

It turns out the difference is based on the framing of the options (opt-in versus opt-out) on the government form. Here is essentially how it plays out:

Yellow Countries (Opt-In Form)
"Please check the box if you want to donate your organs."

Nobody checks the box. Nobody donates.

Blue Countries (Opt-Out Form)
"Please check the box if you do not want to donate your organs."

Again, nobody checks the box...but (because of the form) everybody donates.

Takeaway
This study is a powerful example of how important the default option is in decision making. Making a decision is difficult so often times people resort to the default option. Thus, the manner in which the decision in framed has huge implications for the resulting behavior.
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