The government, engineering an economic rebound with a slew of reforms, has unveiled a new statistical method to calculate the national income with a broader framework that turned up a pleasant surprise: GDP in the past year 2013-14 grew 6.9 per cent instead of the earlier 4.7 per cent.

The revision in base year of India's national accounts will increase the size of the economy to Rs 111.7 trillion (US$ 1.8 trillion) in FY14, according to India Ratings. The size of the Indian economy was at about Rs 93.89 trillion (US$ 1.51 trillion) in 2012-13.

Also, Capital Economics (CE), an independent macro-economic research company, released its India Watch research report recently, cataloguing its interpretation and expectations on the upcoming Budget 2015. It sees Indian economy expanding by 5.5 per cent in 2015, owing to the fall in crude oil prices and interest rates.

Stating that its great time to invest in India, Minister of State for Finance Mr Jayant Sinha said the Indian economy has potential to become a US$ 4-5 trillion economy in the next 10-12 years.