Last week we saw some extra volatility in the market as short-term traders tried to take advantage of the oversold conditions of the US stock market. The S&P 500 gained 4% during a three-day mini-rally, only to give back the entire gain mid-week. Investors also got a first-hand look at the impact high fuel costs are having on retailers. Last week, Target reported that its transportation costs exceeded $1 billion. [...]