Former prime minister Manmohan Singh has been silent since his riveting speech on demonetisation in Parliament last November; so guests awaited eagerly for him to speak at a book release function in the capital on Monday. He spoke, but only in praise of Raj Kapila, a late economist in whose honour his wife Uma Kapila, also an economist, edited the book. Singh had released another book, edited by Rakesh Mohan, last month but did not utter a word. As Singh completed his address and stepped down from the dais, somebody in audience said MMS remained silent on the burning issues