INDORE : Traders across 230 major Agriculture Produce Market Committees in Madhya Pradesh started an indefinite strike from Monday over various demands including reduction in mandi (market) fee currently being charged at the rate of 1.5 per cent, a confederation of traders said.Gopaldas Agrawal, president of the Madhya Pradesh Sakal Anaj Dalhan Tilhan Vyapari Mahasangh, said they have been demanding for a long time that the mandi fee being charged at 1.5 per cent from traders on purchase of crop produce from farmers be reduced.