?????? ???????????? ???? ??????. ????? ???? ?/?/ ???????? fluctuations ?? ??? ????? ?????? ??? ??????. ???????? ?????/???/ ????/?????/demand ?? ????????, ?????/?????/newsw, ?????/????????/events ? ?????/????? ??/policies, ?????/?????/impact {????{ ??fluctuations. ?????????/????????????? ????? ???