<ul data-eligibleForWebStory="true">Amazon's annual Prime Day sale is expanding to a four-day event from July 8 to July 11.A new feature called 'Today’s Big Deals' will offer exclusive daily deal drops for Prime members.Deep discounts from brands like Samsung, Kiehl’s, and Levi’s will be available.Deals will launch daily at midnight PDT and last for a limited time, with new deals appearing every five minutes during select periods.The shift to four days comes amid a rise in Amazon Prime members also subscribing to Walmart+.Consumers are increasingly choosing to utilize benefits from both Amazon and Walmart rather than committing exclusively to one platform.Dual subscribers nearly doubled since 2021, indicating a preference for multi-platform loyalty.Consumers opt for the best offerings from each retailer to maximize perks and combat inflation.Walmart leads in grocery purchases while Amazon dominates online discretionary retail.Dual subscribers outspend other consumer segments on Amazon purchases, with an average of $110 per transaction.Prime-only members spent $78, Walmart+-only members spent $75, and non-subscribers spent $58 per transaction.