Addressing the Governors' Conference here, Singh said the Indian economy, after many years of rapid growth, has slowed down in the past two years.
Inflation, weakening of the rupee and other domestic and external factors contributed to this state of affairs, he said.
"However, we have reasons to be optimistic about the future. There are signs of revival of economic growth on account of the several measures that our government has taken. A good monsoon has also helped us in our efforts.
The Central Statistics Office has projected GDP growth of 4.9 per cent in the current financial year as against 4.5 per cent in 2012-13, which was the slowest in a decade.
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A Finance Ministry document yesterday said a big threat to growth is high inflation as it would impair the ability of the Reserve Bank to cut interest rates to boost economic activities.
"We, therefore, need to urgently address the widening economic, income and developmental disparities between citizens living in such areas and those in more developed parts of the country," Singh said.