“There’s a lot of research about why people lie,” says Dr. Phil. Listing the top reasons that people lie, he says “Number one is to take what’s not rightfully theirs.”

TELL DR. PHIL YOUR STORY: Ready to confront someone?

Other reasons people are untruthful, he says, are to escape accountability, to avoid punishment, to gain an advantage in order to exploit others, “or to create a fantasy, a false self-esteem to escape their mundane life.”

WATCH Why The Ex-Wife Of An Admitted Liar Claims He’s A Trustworthy Person

Watch the video above to learn more reasons why some people are untruthful, and hear how Dr. Phil’s guest, Erik, who is an admitted chronic liar, responds when Dr. Phil asks him, “What do you think fits you here?”

Does Dr. Phil say he has a plan to help Erik overcome his lying behaviors?

The conclusion of this two-part Dr. Phil airs Tuesday. Check here to find out where you can watch.

TELL DR. PHIL YOUR STORY: Do you need Dr. Phil to "get real" with someone?

Today’s Takeaway: Lying Is Not A Victimless Act