In the following introductory paragraph, what is the thesis?: "Working part-time as a cashier at the Piggly Wiggly has given me a great opportunity
to observe human behavior. Sometimes I think of the shoppers as white rats in a lab experiment, and the aisles as a maze designed by a psychologist.
Most of the rats-customers, I mean--follow a routine pattern, strolling up and down the aisles, checking through my chute, and then escaping through
the exit hatch. But not everyone is so dependable. My research has revealed there are three distinct types of abnormal customer at your typical grocery
store: the amnesiac, the super shopper, and the dawdler."