New Delhi, 20 May (NNS): The prices of black pepper markara remained stable at Rs 670 per kg owing to the sluggish buying from the stockists even after the higher prices. Recently, the prices have gone up by Rs 15 per kg. The trading activities reported to be sluggish in Kochi due to the constant rainfall and the prices also rose by Rs 15 per kg. There is no possibility of more downtrend in the prices during the coming days.