Trading in the U.S. index futures suggests that Wall Street stocks may open Friday’s session higher, as traders seek bargains, reassured by Fed Chair Janet Yellen’s comments that rate increases will only be gradual. European stocks are also sharply higher after the Asian markets meandered to a mixed close. The dollar is higher and commodities are weaker, even as the crude oil prices are higher. The domestic markets may also focus on economic readings on service sector activity and consumer sentiment.