Imphal, Sep 22 (UNI) Manipur Chief Minister Yumnam Khemchand Singh today called for collective efforts towards the economic development of the state and appealed to people to resolve grievances through dialogue instead of bandhs and blockades. The Chief Minister was speaking at the Seva Sankalp Abhiyan programme organised by the Imphal West District Administration at Khoyathong Multipurpose Community Hall.