*U.S. 10-Year Treasury Yield at 5.25% Is Attractive for Buyers, American Century Investments Says *Competition From AI-Related Credit Boom Is Major Factor Behind Spike in Government-Bond Yields: American Century Investments *Projected Multi-Trillion AI Spending Boom Is Unrealistic, Could Result in 'Buyers' Strike': American Century Investments *Market Pricing for Up to Four Fed Rate Hikes Over Coming Year Is Overly Aggressive: American Century Investments *Cracks Are Appearing in Lower-Tier Credit, Notably in CCC-Rated Corporate Bonds: American Century Investments(彭博社)