World's richest man Elon Musk hinted that he plans to donate his entire fortune while responding to Nobel Prize-winning economist Daron Acemoglu's challenge. "If money won’t matter in 2036, why don't you (Musk) pledge to donate your current wealth of approximately $1 trillion to charity," Acemoglu said. "I am actually going to do something along these lines!" Musk replied.