One (the Economist-Tim Harford) argues that they are predominantly rational while the other (the Behavioral Economist-Dan Ariely) argues that they are predominantly (predictably) irrational.
The first link will take you to a webpage of Tim Harford's (the "rational" Economist) videos. The Second link will take you to Dan Ariely's (the "predictably irrational" Behavioral Economist) videos. The third and final link will take you to their debate.
ps: if you are not able to access youtube videos, have you ever heard of vtunnel.com or any of a large number of solutions?
Tim Harford and his "logical" and "rational" views
Dan Ariely and his "predictably irrational" views
The Harford-Ariely debate
put together by ATJ