Final answer:
A temporary period of unusually high sales driven by consumer enthusiasm is called a sales boom, often influenced by advertising or external events.
Step-by-step explanation:
A temporary period of unusually high sales driven by consumer enthusiasm and immediate product or brand popularity is called a sales boom. Such a period may be influenced by various factors including effective advertising using tactics such as the bandwagon fallacy, where advertisers create a sense of urgency or a trend that 'everyone' is buying the product. Additionally, external events such as changes in consumer optimism or situations that require the rapid purchase of goods, like a national emergency, can also lead to a sales boom.