premise: Some of these problems are neither new nor unique to the OTC market. But the big, often tumultuous slide in stock prices this month has turned some of those who have been profiting from the practice against it.
  Peter DaPuzzo, head of retail equity trading at Shearson Lehman Hutton, acknowledges that he wasn't troubled by program trading when it began in the pre-crash bull market because it added liquidity and people were pleased to see stock prices rising.
  "We weren't as concerned until they became sell programs," says Mr. DaPuzzo, who now thinks it adds unnecessary volatility. Shearson Lehman, however, executes program trades for clients.
   Why wasn't Shearson Lehman Hutton troubled by program trading?
hypothesis: people were pleased to see stock prices rising