ASTANA. May 4. KAZINFORM. Head of the State Nursultan Nazarbayev has signed the Law “On commodity exchanges”, which regulates public relations in the process of activity of the commodity exchages and commodity trading; Kazinform refers to the President’s press service.Besides, the President signed the Law “On introduction of amendments to certain legislative acts of the Republic of Kazakhstan on the issues of commodity exchanges”. The texts of the laws are published in the press.