Stocks headed for their biggest daily decline in a month on Friday, capping a week of turbulence on Wall Street as investors struggled to calibrate their expectations for inflation and interest rates.The S&P 500 was down as much as 1 percent before midday. A drop of that size is relatively ordinary by historical standards, but it stood out on Friday because the index had made only small moves over the past month. It also would be the fourth consecutive decline for the index.Investors have been focused this week on the Federal Reserve and the potential for it to increase …
