The Washington Post THE MARKET  
NEW YORK, March 11ÛÓThe stock market posted a moderate loss today, weakening near the close of an erratic session.</br></br>The Dow Jones average of 30 industrials, up about 14 points in the early going, finished with an 11.11 loss at 2268.98. The average climbed 19.97 points on Tuesday.</br></br>Volume on The New York Stock Exchange reached 186.88 million shares, up from 174.76 million in the previous session.</br></br>On one hand, they said, money managers at investing institutions were eager tobe heavily invested in the market by the end of March, so as not to show any large cash positions in their quarterly reports to clients in the midst of a vigorous bull market.</br></br>On the negative side, however, many Wall Streeters are worried about possible periods of volatility with a ÛÏtriple witching hourÛ approaching on March 20.