Blackstone's Byron Wien believes the rally is in a danger zone.
Wien said speculation in the market could reach an extreme as the U.S. economy has a better year than 2017.
Despite the rough start to the year, Blackstone's Byron Wien told CNBC he thinks the S&P 500 will produce a 15 percent return for 2015.
How will the economy and markets play in 2014? What about Hillary Clinton and Ted Cruz? Blackstone Advisory Partners' Byron Wien gives his annual new year's predictions.
12 golden rules.
Byron Wien, Vice Chairman, Blackstone Advisory Partners, has issued his list of Surprises for 2012.