On Monday, Nifty s Midcap 100 index fell 2.5% - its biggest single-day fall since January 23, and the Small Cap 100 index slumped 4% - its biggest fall in a day since September 12 last year. The Nifty Microcap 250 declined 3.9%. The Sensex and Nifty shed 0.7-0.8% each Monday. On Friday, the small-cap and mid-cap indices fell between 2% and 3%.