NATION'S 'TWO-TIER' ECONOMY
America's economy has developed a split personality - languid in manufacturing but dynamic in the services sector - that complicates efforts to stimulate production, economists say. ''The two-tier economy is very clear-cut,'' said Walter K. Joelson, chief economist of the General Electric Company. ''We're in recovery, yet industrial production is as flat as an ironing board. So you have to ask yourself what the dickens is going on. If industrial production is not expanding in a recovery, it sure isn't going to expand in a recession.''