No one knows where the market is heading. After an extraordinary rally in 2005 and the first quarter of 2006, prices collapsed. However, on the long term value in addition to cost should be the criteria for deciding which company is a good investment. You need to pay less and get more. Lower cost and higher value.
Some investers kept on buying while the prices fell in order to get a lower average buying price. What a mistake. If you are in a hole, you do not dig deeper.
If the fundementals of a company are strong, eventually its shareprice will improve. Things do not happen overnight. You can not produce a baby in one month by making nine women pregnant. In business, things have to take their time and there are no short cuts.