Review: It's a Mall World After All by Janette Rallison

From Goodreads:
It's too bad they don't give out diplomas for what you learn at the mall, because I could graduate with honors in that subject.  No really.  Since I've worked there, I've become an expert on all things shopping-related. For example, I can tell you right off who to distrust at the mall:
 
1) Skinny people who work at Cinnabon.  I mean, if they're not eating the stuff they sell, how good can it be?

2) The salesladies at department store makeup...