In a recent blog post on the Harvard Business Review bloggers network, we discuss the sustainability of the advantage that come from innovating the business model. With the Winter holiday shopping season, fashion apparel retailer Zara has been the focus of media attention — the New York Times recently profiled the innovative fast fashion business model pioneered by Zara, while Elizabeth Cline’s book on the costs of fast fashion has climbed up the sales charts. Despite this very recent popularity, the novel business model of Zara has gone virtually unnoticed for over 30 years, allowing Zara’s parent company, Inditex, to grow from zero to almost $20B in revenues. Why wasn’t it copied immediately? How can it be so sustainable and continue growing? The answer lies in a different type…