WASHINGTON — The world economy faces the increasing risk of a painful slowdown amid worries about the global banking system and concerns that rising interest rates could force banks to curtail lending, the International Monetary Fund said on Tuesday.The warning follows weeks of turmoil in the global banking sector, which included two bank failures in the United States and UBS’s takeover of Credit Suisse, brokered by the Swiss government. Fears that bank runs would ripple through the financial system have abated in recent weeks, but concerns that additional bank failures and tightening lending standards could slow economic output around the world remain.In its latest World Economic Outlook report, the I.M.F. made a slight reduction to its growth …
