While Businesses Suffered, a Few Made Out
Many experts say it is far too early to calculate overall economic effect of blackout on New York City; most businesses suffered, but some, including pay phone operators and street vendors gained; Consolidated Edison and city face increased overtime expenses, but that spending may boost area's economy; City Council finance director Larian Angelo estimates blackout will cost city $30 to $40 million in lost tax revenue and cost residents total of $500 million to $750 million in personal income; economists are fairly sanguine about overal economic effects (M)