New Delhi, 22 April (NNS): The prices of big cardamom kainchicut improved by Rs 10 to Rs 1660 per kg owing to the weak sale even after the normal level after the downfall in the prices during the previous days. Recently, the prices have gone up in the same ratio. The average auction price declined to Rs 1375/1675 per kg in the last auction which held on 16th April. There is no possibility of downfall in the prices during the coming days.