May 20 (Reuters) - The benchmark S&P 500 index (.SPX) is trading down 20% from its Jan. 3 record close in volatile trading on Friday, as investors fretted over the impact of rising inflation on e… [+3245 chars]Read the whole story by on Reuters:https://www.reuters.com/markets/europe/sp-500-pace-confirm-bear-market-falls-20-record-close-2022-05-20/