The Fed Chief's Treatment; Slower Growth, but Don't Rule Out Rate Increases
Federal Reserve chairman, Alan Greenspan, says there is not yet enough evidence to conclude that economy has slowed to noninflationary pace, and leaves door open to further interest rate increases as soon as August, testimony before Senate Banking Committee; sees no need for prolonged series of rate increases that might leave economy flirting with recession; says he does not believe Federal Reserve will have to drive unemployment rate up toward 5 percent from 4 percent to achieve price stability; photo (M)