Optimizing e-commerce websites through A/B testing can significantly enhance revenue-per-visitor (RPV) by implementing strategies such as scarcity indicators, social proof, and urgency timers. According to a study by the personalization firm Qubit, scarcity indicators, like displaying the number of items left in stock, can increase RPV by an average of 2.9%, while social proof, which shows user interactions with products, can lead to a 2.3% lift. Urgency timers, used to encourage quick checkouts by displaying a countdown, can boost RPV by 1.5%. Real-world examples include Sur La Table's scarcity messages, Betabrand's social proof through design votes, and OpenTable's effective use of urgency timers. These techniques should be used thoughtfully to avoid overwhelming customers, but when combined, they can create a more compelling shopping experience and drive conversions.