According to the global financial services major, a recovery in growth could bring more than USD 1 trillion in extra household savings into the financial system over the next five years.
"The Prime Minister's ambitious plans for growth and prosperity thus hinge on India's ability to mobilise enough funds for all this spending," HSBC said in a research note.
According to the global brokerage firm, the national savings rate is about 30 per cent of GDP. To achieve GDP growth of 7-8 per cent during Modi's first term in office, investment needs to rise to at least 35 per cent of GDP.
HSBC, however, added that to ensure that a big chunk of this enters the formal financial system, inflation needs to be contained and financial inclusion improved.
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Better public infrastructure support and easier trade would increase the size of the corporate sector and therefore the size of the savings generated.
"We estimate that public sector saving could climb by 0.4 -1.8 per cent of GDP over the next five years if reforms are implemented," HSBC said adding that in total, domestic saving could rise by 2-5 per cent of GDP over the next five years -- hardly small change.
Moreover, sustaining reform momentum is important to keep equity markets buoyant, thus reducing corporate leverage and boosting savings, it added.