Wall Street opens lower; investors grow cautious on outlook

Stocks were slightly lower in early trading on Friday, retreating from highs the market set the day before.
 

The market remains focused on trillions of dollars of potential government aid that could be coming for the economy, as Democrats move forward with their stimulus package.
 

The S&P 500 index was down less than 0.1 per cent as of 9:50 a.m. Eastern. The Dow Jones Industrial Average was down 0.1 per cent and the Nasdaq Composite fell 0.2 per cent. The Russell 2000 index of small companies was down 0.5 per cent.
 

Investors are hoping for a new round of US