Show Hide image 22 June 2012 Chart of the day: Fleeting returns A new study by the Royal Bank of Canada finds that the positive market boost from each new intervention by EU officials is taking less and less time to unwind. Whereas the August announcement that the ECB would begin buying bonds calmed the Spanish and Italian markets for 48 days, the removal of Berlusconi in November lasted 48 hours – and the report puts the boost from Samaras winning the Greek election at just two hours. 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.