1970's Redux: Could a Mideast War Bring a New Oil Price Shock?
Floyd Norris column on prospects for revisiting 1970's, when Arab oil producers lashed out at US for helping Israel win Yom Kippur War and delivered shock to both Arab and industrial worlds; recalls how that oil shock undermined self-confidence of Western economies and led to rapid reversals in American politics, costing Republicans the White House in 1976 and helping them regain it in 1980; graph (M)