Goldman Sachs has issued 'Buy' call on 20 stocks, adding that India is poised to be one of the fastest growing economies in medium-term. The stocks include Reliance Industries, L&T, NTPC, M&M, UltraTech, Power Grid, Adani Ports, IndiGo, Eicher Motors, Havells, Polycab, Ashok Leyland, Phoenix Mills, Uno Minda, Hitachi Energy, Astral, Embassy REIT, Kajaria Ceramics, Blue Dart and Amber Enterprises.