I have underlined the most important part in bold from our IEC standards. You can very well understand for whom the economic advantage is!!!. The most audacious part is that this sentence is there in the IEC standards document
The standard voltage ( in India ) for low and medium line distribution was 230 V for single phase and 230 / 400 V for three phase system but due to economic advantage IEC recommended 240 V for single phase and 240 / 415 V for three...