oint," said a currency options dealer. "Some say we  could go to 90 cents, others say we can go to parity. The market is still very nervous."  Widening differentials are likely to hurt the euro further. Analysts expect another U.S.  interest-rate increase by month's end, particularly after the Federal Reserve's latest beige  book reported "appreciable expansion" in the U.S. economy from January through  February.  Early last week, Europe's common currency plunged to a record of 93.90 cents after it  became apparent that the European Central Bank wouldn't raise interest rates at its  midweek meeting. Although the euro was trading yesterday two cents above its all-time  lows, analysts aren't ruling out the possibility of a return to those earlier levels -- especially  if the Fed raises rates as expected in late March.  The Australian dollar rose to 60.92 cents late in New York from 60.50 cents late Tuesday.  The Australian Reserve Bank said yesterday that it had opted to leave interest rates  unchanged.  The South African rand retraced earlier losses against the dollar. It ended the New York  session at 6.4685 rand to the dollar, compared with 6.5315 rand late Tuesday. Steven  Leach, chief economist for Citibank's foreign-exchange desk in New York, wasn't surprised  by the rand's reversal. He said the South African currency, which is still down more than  5% against the dollar for the year, has been undervalued at recent levels.  The dollar also slipped further against the Mexican peso, as the Mexican stock market  surged more than 3.6%. Late yesterday, the dollar was buying 9.269 pesos, compared with  9.28 pesos late Tuesday. ...