Show Hide image 18 June 2012 Chart of the day: That "incentive to strike" in full Iain Duncan Smith says that the benefits system as it stands, where strikers claim tax credits based on their post-strike income, "creates perverse incentives" to strike. What do you think? By Alex Hern Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.