Since the crash of ‘08, banks have paid out more than $80 billion in bonuses. Since 2007, the five biggest banks in America have become larger. Today, they control assets equal to 56 percent of the American economy.

Nearly four years after the collapse of Lehman, has anything changed on Wall Street that would prevent a similar crisis?

In the fourth hour of Money, Power and Wall Street, producers Martin Smith and Marcela Gaviria document a Wall Street culture that remains focused on making risky trades.

For more than three years, regulators have tried to fix an industry steeped in conflicts of interest, excessive risk taking, and incentives to cheat. New rules and regulations are being written, but can they fend off the next crisis?

Martin and Marcela will be joining us for a live chat to discuss these questions, and take yours.

They’ll be joined by guest questioner/resident expert Felix Salmon, finance blogger and editor for Reuters. He recently wrote a post on “The multimillionare men of Lehman,” as well as an assessment of Money, Power and Wall Street.

You can leave a question in the chat window below, and come by at 1 p.m. ET on Thursday, May 3 to join the live discussion.