[4/28 10:00] Citigroup raises AI market view above $4 trillion / 43% of retailers piloting AI shopping agents

AI News Flash for April 28, 2026 at 10:00 UTC. Topics: 1. Citigroup raises AI market view above $4 trillion https://www.reuters.com/business/finance/citigroup-lifts-ai-market-view-over-4-trillion-enterprise-adoption-2026-04-28/ 2. 43% of retailers piloting AI shopping agents https://www.pymnts.com/artificial-intelligence-2/2026/43-percent-of-retailers-are-piloting-ai-shopping-agents/ 3. Chip startup tackles AI memory wall https://www.wsj.com/tech/chip-startup-aims-to-shatter-ais-dreaded-memory-wall-b5f4c563 4. Asia far more excited about AI than US https://flowingdata.com/2026/04/28/asia-is-a-lot-more-excited-about-ai-than-the-u-s-is/