[Shanghai and tin yesterday hit 230000 yuan / ton Guotai Junan and other 17 seats reverse reduction of long positions] April 19, small varieties welcome the big market. Recently, tin futures prices inside and outside the market have strengthened continuously. Shanghai tin not only ushered in the limit board, but also hit the 230000 yuan / ton mark in midday trading on April 18. In the view of a number of analysts, based on the current global spot tin supply and demand pattern, short-term tin prices will still be easy to rise and difficult to fall, but from the perspective of institutional positions, 17 of the top 20 main seats have been reduced in the bulls, reflecting a decline in trading sentiment towards tin prices. (Securities Daily)