Which of the following is an example of co-purchasing behavior?

Co-purchasing behavior refers to the tendency of consumers to purchase related items together, often because they complement each other in use or function. The example provided, which involves purchasing skis and ski boots, clearly illustrates this concept. These two products are often bought simultaneously as they serve a common purpose—enabling the winter sports activity of skiing. Customers recognize that to ski effectively, they need both the skis and the appropriate footwear, leading them to make these purchases in tandem.

In contrast, the other options do not align with co-purchasing behavior. Reading product reviews online is a part of the information-gathering process before making a purchase decision. Following brands on social media can help in brand engagement and staying updated, but does not inherently relate to making purchases. Online shopping cart abandonment refers to the scenario where consumers add items to their online cart but fail to complete the purchase, which is more about shopping behavior than co-purchasing. Thus, the purchase of skis together with ski boots is the most accurate reflection of co-purchasing behavior.