The Invesco S&P 500 Equal Weight ETF (RSP), which follows the S&P 500 Equal Weight Index (EWI), rose 0.4% on Friday. U.S. stocks retreated this week after updated data showed that core inflation jumped to a three-decade high in October with prices rising across an array of goods and services, the Wall Street Journal reports. Signs that a spike in inflation will last longer than what many central bankers had anticipated also fueled expectations that the Federal Reserve could hike borrowing costs by summer to get a better handle on the inflationary pressures.