PM Narendra Modi with Emeritus Senior Minister, Goh Chok Tong after unveiling a plaque marking the immersion site of Mahatma Gandhi's Ashes, at Clifford Pier in Singapore. Pic/PTI

It was a volatile week on expected lines, but the kind of short covering one saw on Thursday, which was expiry day was unexpected. BSESENSEX gained a massive 416 points on expiry day while NIFTY gained 122 points. If one looks at it in another way if expiry day movement had not happened markets would have ended in negative territory on a weekly basis.