"Price rise of essential food items do not depend on rising petrol and diesel rates alone," Assam Transport Minister Ajit Singh said at the Assembly here.
He said fluctuation in petroleum products' prices did not result in the rise or fall in passenger fares.
"That is why, passenger fares are at a justified level despite falling rates of crude in international market," Singh said during a discussion in the House.
Singh informed the House that last increase in passenger fares took place on November 7, 2012 when the diesel rate was Rs 50.68 per litre.
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On August 31, 2014, the diesel price was Rs 61.79 a litre and there was no increase in passenger fares since November 2012, he added.
Since October last year, diesel prices have started to come down and stood at Rs 52.16 in every litre on March 10, 2015, Singh said.