Firms strive for sustainable competitive advantage, financial performance that consistently outperforms their industry peers. The world is so dynamic, with new products and new competitors rise seemingly overnight, that truly sustainable advantage might seem like impossibility, but there are winners and the Zara chain is one of them. The Zara fashion chain, founded in 1975 in Arteixo, is perhaps the world's most successful clothing chain. Zara has helped its parent, the Spanish firm Inditex, grow from obscurity in the mid. 90’s to the world's third largest pure-play fashion retailer after the Swedish H&M and US-based Gap Inc. with financial performance well ahead of these rivals. With 1021 shops, at 13.04.2007, in 55 countries, Zara appears to have found the formula for success: Give the public what it wants, at the lowest possible price, in the shortest time possible. In order to think about how the firms achieve sustainable advantage, it's useful to start with two concepts defined by Michael Porter: operational effectiveness and strategic positioning.

(I) OPERATIONAL EFFECTIVENESS

According to Porter, the reason so many firms suffer aggressive, margin eroding competition, is because they've defined themselves according to operational effectiveness rather than strategic positioning. Operational effectiveness refers to performing the same tasks better than rivals perform them. Everyone wants to be better, but the danger in operational effectiveness is in "sameness". At its heart Zara is building on a vertically integrated demand and supply chain, while most other textile chains rely on outsourcing and cheap labor in China. It enables company to short turnaround times and achieves greater flexibility, reducing stock to a minimum and diminishing fashion risk to the greatest possible extent. In terms of speed to market, Zara has much in common with the computer