It looks like you are searching for a PDF of the book Predictably Irrational by Dan Ariely (the Portuguese title is Previsivelmente Irracional ).
But here is the magic: When Ariely added a "Honesty Code" (a simple reminder of moral standards) at the top of the page, the cheating stopped completely—even though the students could still shred the test. We don’t cheat for maximum gain; we cheat just enough to feel good about ourselves. And a simple reminder of our values is enough to stop us. If you searched for "Previsivelmente Irracional pdf" hoping to download it for free, I understand. But here is the irony: Ariely’s whole point is that free often costs us more in the long run. previsivelmente irracional pdf
We are predictably irrational.