The stock market had a relatively quiet day on Tuesday, leaving major benchmarks little changed from yesterday’s close. After initial optimism about the prospects for tax reform, investors seem to now grasp the challenge in getting legislation through Congress quickly enough to implement changes for the 2018 tax year. Many believe that the strong performance in stocks in 2017 has hinged on eventual reductions in the corporate tax rate, and if tax reform grows less certain, markets could see their volatility levels increase.