Amazon has announced a significant expansion of its same-day grocery delivery service, now available in over 2,300 cities across the U.S. Prime members can enjoy free delivery of perishable items, including fresh produce, meat, and dairy, further intensifying competition in the grocery market with rivals like Instacart and Walmart. This move not only aims to cater to increasing consumer demand for quick and convenient grocery shopping but is also likely to disrupt traditional grocery retailers, leading to a downward trend in their stock prices.