According to "A Pursuit of Wealth" by Sicelo P. Nkambule, David Rubenstein expressed fear that the private equity boom would end in January 2006: "This has been a golden age for our industry, but nothing continues to be golden forever". One month later, he said: "Right now we're operating as if the music's not going to stop playing and the music is going to stop. I am more concerned about this than any other issue". According to Nkambule: “These concerns proved to be right as at the end of 2007 the buyout market collapsed...As leveraged loan activity came to an abrupt stop, private equity firms were unable to secure financing for their transactions.”