The risks cut both ways: Too much stock can bring slower turnover and cash flow, while too little can mean lost sales.

FORBES: Magazine Article

The average stock fund has a turnover in the vicinity of 100% , which means that in the space of 12 months it buys and sells an amount of stock equal to its net assets.

FORBES: The hidden cost of trading

Last year, turnover at the New York Stock Exchange, the world's busiest, reached six times the level of 1982.

ECONOMIST: BRITAIN SPECIAL: GLOBAL INVESTMENT BANKS: Fools’ gold | The