This is more of a threat than an analysis. But if a wrong downgrade can make a difference to US markets and interest rates, so can it for India's. The real difficulty is one that emerges from an analysis by Cornell economist Easwar Prasad in the Financial Times. That analysis suggests that though India's gross public debt to GDP ratio declined from 75.8 per cent to 66.2 per cent between 2007 and 2011, it still is among the highest in the region. India's 66.2 per cent level compares with Malaysia's 55.1, Pakistan's 54.1, Philippines' 47, Thailand's 43.7, Indonesia's 25.4 and China's 16.5.

So if S&P needs a target to declare that some governments in the Asia-Pacific are excessively indebted, then India is in the firing line. It is no doubt true that a number of factors make Indian public debt less of a problem than in many other contexts. To start with, much of public debt in India is denominated in Indian rupees and is owed to resident agents and therefore is unlikely to be adversely affected by uncertainty in international debt and currency markets. Secondly, within the country public debt is largely held by the banking system dominated by public sector banks. They are subject to government influence and are unlikely to respond to developments in ways that make bond prices and yields extremely volatile. Given these circumstances, public debt is not a potential trigger for a crisis and in any case should not worry private financial interests.