Maintaining 4 per cent inflation is appropriate for India as targeting a lower rate could impart deflationary bias to the monetary policy, said a Reserve Bank paper. Under the current dispensation, the RBI has been mandated by the government to maintain retail inflation at 4 per cent with a margin of 2 per cent on either side. The paper, authored by RBI Deputy Governor Michael Debabrata Patra and another official Harendra Kumar Behera, has found a steady decline in trend inflation to 4.1-4.3 per cent since 2014. "A target set too below the trend imparts a deflationary bias to monetary policy because it will go into overkill relative to what the economy can intrinsically bear in order to achieve the target.