Samantha recently returned from a grocery store. While at the store, she noticed a point-of-purchase display that was advertising three boxes of cookies on special, which she purchased. When Samantha arrived home, her husband Greg was extremely angry with her for buying cookies that they didn't need. He referred to her behaviour as being compulsive. Is he right?

Compulsive consumption refers to repetitive shopping, often excessive, done as an antidote to tension, anxiety, depression, or boredom. "Shopaholics" turn to shopping in much the same way as those with addictions turn to drugs or alcohol.
Compulsive consumption is distinctly different from impulse buying. The impulse to buy a specific item is temporary, and it centres on a specific product at a particular moment. In contrast, compulsive buying is an enduring behaviour that centres on the process of buying, not the purchases themselves.
Given that Samantha's purchase may be a one-time purchase and not an example of a repetitive behaviour, her husband may be incorrect in his conclusion. If it was an example of repetitive behaviour then he was right.