The Chairman of Prime Minister's Economic Advisory Council C Rangarajan said that there could be decline in food prices in the coming month. Talking to reporters in New Delhi, he said inflation is also likely to fall between 5.5 to 6 per cent by March 2011 from 8.62 per cent in September this year. Exerting that food prices are still at high levels, Mr Rangarajan said, the Reserve Bank's decision to tighten monetary policy further will depend on inflation behaviour in the month of December. To tame inflation, RBI had earlier this month increased its short-term lending (repo) and borrowing (reverse repo) rates by 25 basis points to 6.25 per cent and 5.25 per cent, respectively. This was the sixth time in this fiscal that the apex bank had raised key lending and borrowing rates to cool inflationary pressures in the economy.