創意產品在某時點價格常常受到該時點前之歷史價格的影響，因為人的行為模式具有模仿性，亦就是具有參考群體的特性，這是一種從眾心理的效應。消費者藉由模仿歷史價格來進行對產品價格認知的編碼，在有效資訊與訊息不對稱的貧乏下，跟著別人的經驗做，出錯的機率較低，因此消費者的購買行為會受到從眾心理的影響，又歷史價格的變化及新價格訊息的傳播擴散速率是影響消費者對創意產品的價值評估的重要因素，本研究構建一個動態需要函數以及一個數學模型來反映此一現象。

The time point of the creative product price will be influenced by the historical price before the time point. The nature of human behavior possesses imitation. That is also the characteristic of reference group. Consumers encode the product price cognition by modeling the historical price. Under the situation of valid information and asymmetric information shortage, the probability of mistakes will be reduced if people follow the other's experience. The consumer purchase behavior will be influenced by the historical price and the limit of information cognition. Therefore, they will make deviation on the purchase decision. The change of the historical price and spreading speed of new price information are the key factors which influence the consumer value evaluation to product. That is the reason that we want to construct a dynamic demand function and mathematical model to reflect the phenomenon.