Most sector funds have a minimum of 25% of their assets invested in its specialty.

You will need to keep a significant portion - perhaps at least half - of your assets invested for growth, even after retirement.

Of all domestic equity funds, almost 1,200 have had some assets invested in tobacco stocks over the last six months, according to Morningstar.

They are generally stated as a percentage of the amount of assets invested in the fund.

Between 1924 and 1929, for example, the assets invested in mutual funds rose from just $2 million to $134 million.

An overwhelming 87 percent said it was too risky to have a large percentage of their personal assets invested in the stock of any single company.

Consider the Vanguard 500 Index fund, which has had annual expenses of about 20 cents for every $100 in assets invested over the last decade.

These funds are responsible for the management of a significant volume of assets invested in Europe and can exert a notable influence on the markets.

The two also increased moderately the percentage of their funds' total assets invested in their top 10 holdings.

Combined with assets invested in money market funds, total mutual fund investments exceed $2.7 trillion.