Goldman Sachs analyst Daniel Harris changed the ratings on a slew of brokerages and stock exchanges Monday, citing improvements in mergers and acquisitions and a possible slowdown in fixed income.

Of the world’s biggest media companies, the one that might seem in the best position to ride out the recession is Vivendi, whose headquarters in the shadow of the Arc de Triomphe oversees a sprawling empire of music, pay television, video game and mobile phone businesses.

Flying home to New Jersey from Chicago after the first two days at his new job, Sergey Aleynikov was prepared for the usual inconveniences: a bumpy ride, a late arrival. He was not expecting Special Agent Michael G. McSwain of the F.B.I.