The customer is not always right

Some instances the sales person is more knowledgeable than the customer especially on subjects that are not common knowledge to everyone such as how electronics work. A customer may what to hook up their computer to two different monitors for example and show one big picture across the two monitors. The customer may see a cable that looks like it may work but it actually just feeds the same picture to both monitors and they might want it because it is cheaper but that is where a sales person's knowledge comes in to make sure they will get the correct product for them so that they are satisfied customers. Other situations is when a cheaper product is of inferior quality and will not do the job that the customer wants due to this inferior quality. This is why the customer is not always right