jpmorgan chase  co posted a decline in trading revenue that was steeper than analysts expected and both commercial and consumer loans fell from a year earlier shares of the company dropped after the firm reported a 16 slide in fixedincome trading revenue analysts had been expecting that business to fall 135 still the company’s dealmakers posted their best quarter ever on a booming mergerandacquisition market and chief executive officer jamie dimon gave an upbeat assessment of prospects for growth