??? ???? ?? ????? ????? ??????????? ????? ?? ??? ?? ??? ??? ??? ?? ?? ??? ?? ?? ????? ????? ?? ?? ????? ????? ?? ??? ??? ??? ?? ?? ??????? ?? ?? ????? ????? ??????????? ????? ????? ???? ????? ?? ????? ??????? ????? ???: In 1961, the The big apple Cotton Exchange stopped the practice, which