Wall Street’s wild week shows just how fragile confidence in the stock market has become

Recent rallies in stocks haven’t been built on anything solid, says Steve Sosnick, chief strategist at Interactive Brokers. - MarketWatch photo illustration/iStockphoto Volatility on Wall Street this week was a reminder of just how frail conviction around the stock market has been: Every bounce was sold, every selloff spiraled and investors still were skeptical if it had bottomed. Then came Friday — almost on cue, buyers finally stepped in, raising the question of whether the sudden rebound in stocks was ...