Investors can expect volatility in H&R Block (NYSE: HRB) , Kroger (NYSE: KR) , and Bob Evans (NASDAQ: BOBE) stocks over the next few trading days. Rising prices are also expected to push profit margins higher, which helps explain why Wall Street is looking for strong earnings growth this week. Its volume of sales also improved at a healthy clip, which suggests that much of the past year's decline was about price deflation rather than rising competitive threats.