JPMorgan Chase & Co. Chief Executive Officer Jamie Dimon said on Monday the economy is generating so much inflation that the Federal Reserve might have to raise short-term interest rates more than four times this year. Dimon: ‘It’s possible that inflation is worse than people think. I, personally, would be surprised if it’s just four increases this year. Four would be very easy for the economy to absorb,’ he said. As Dimon spoke, recent volatility in the stock and bond markets continued. Wall Street’s main indexes tumbled on falling prices for technology stocks, which have been hit hard by expectations for higher U.S. Treasury yields. The Nasdaq (.IXIC) was down nearly 2% and about 9% below its Nov.