The lie is a condition of life.
We love child's studies as they tell us more about our child than most parenting books. We did a dozen of studies at the NYU infant labs when Little N. was smaller. So, now we're doing a Deception study at the John Jay college in NYC. Read more about the study here.
For the next two weeks we'll be keeping a diary of her lies. That will include all kids of lies. She's pretty honest even when given an opportunity to lie for a benefit of self, she choose to tell the truth (and not get a price), nevertheless she tells different kind of lies all the time. For amusement, to buy more playtime, etc. We'll see what the diary shows.