US Productivity Growth Slows in Q4 as Unit Labor Costs Accelerate Social Security Timing Dilemma Claim Now or Wait for Survivor Benefits at 67 SP 500 Edges Higher as Healthcare and Tech Lead Communication Services Lags Indias Consumption Reset Shift to Experiences and Premium Products US House Foreign Affairs Committee Chair Warns of Chinas Growing Role in Argentina Contract Bid DRAM ETF Surges to Record 10 Billion as Memory Chip Demand Becomes Key AI Infrastructure Berkshire Hathaway Restructures Portfolio with Major Stakes in Delta Air Lines and Alphabet