What Percentage Of Overal Trading Volume Are Personal Finance Traders?

For example, how much are prices of stocks affected by institutions (e.g. funds) and how much by small personal traders. If they recommend a stock in a financial magazine (e.g., Kiplinger), will it affect its price significantly – individual traders wanting to buy it? How big volumes are “day traders” – 10%, 20% or 0.2%?

Technorati Tags: Finance, Overal, Percentage, Personal, Traders, Trading, Volume, What