Mamata speaks for investment across India at BGBS fuelling speculations about her Delhi bid

In the last part of her address at the summit, Banerjee referred to some of the problems the industrialists faced and left the country.

Though the outcome of the forthcoming polls is not certain, the Chief Minister, who is presently the chief architect of anti-Modi Opposition unity in India, surprisingly said she will bring "new industrial policies" after the "government changes".

"I know that some industrialists have left the country due to some problems and difficulties. We have General Elections shortly, so I assure you that after the government changes, we will bring new industrial policies which will boost up the economy of our country," Banerjee said in an unprecedented address where she was meant to attract business for her state, which saw no heavy industry after the exit of Ratan Tata's Nano project back in 2008.

Taking the names of several states, TMC supremo Banerjee said she wants all states to grow equally.

Banerjee's comments are expected to gain significance as several of her supporters and party men have already expressed their wishes to see their leader in the Prime Minister's chair, which is presently occupied by BJP's Narendra Modi.

In the ongoing tussle with the BJP, particularly during her protest dharna against the CBI this week, the TMC chief almost took a pledge to oust the Modi government from the Centre by forming a united Opposition.

Her wish to defeat BJP by forming a united Opposition has also been supported by almost all opposition parties leaving only BJD and TRS, which rule Odisha and Telangana respectively. 

She also held a "United India" rally at the iconic Brigade Parade Ground in Kolkata on Jan 19. The rally saw a line of opposition leaders as well as few rebel BJP leaders.

However, Banerjee, who became the Chief Minister in 2011 ending the 34-year old Left rule, never openly said she wants to become the Prime Minister, always adding that she would like to play "a small role" in dethroning the saffron party, which swept the 2014 Lok Sabha polls.

Interestingly, on Tuesday, Andhra Pradesh Chief Minister N Chandrababu Naidu referred to Banerjee as the "architect and main pillar of the opposition unity" when the latter announced the withdrawal of her sit-in protest (dharna) against the CBI's move to arrest Kolkata Police Commissioner Rajeev Kumar in chit funds scam case.