On the New York Mercantile Exchange, the price of oil reached a level of $53.31. Thus, in a day the increase amounted to 31 cents, and in a week - $3. \nAirlines and road carriers are forced to raise prices. Meanwhile, the government of Nigeria - the largest African oil producer - failed to reach an agreement with local trade unions. \nAs NTV television company reported, on Monday oil workers plan a nationwide strike.