The essence of the concept circular economy was determined. processes transition to a are analyzed, as result which three levels distinguished: efficient use materials; product life extention; smart production and products. connection between sustainable development implemented. main business models considered: Resources recovery, Sharing platforms, Product extension, service, Circular supplier...

we introduce a new concept of general $g$-$eta$-monotone operator generalizing the general $(h,eta)$-monotone operator cite{arvar2, arvar1}, general $h-$ monotone operator cite{xiahuang} in banach spaces, and also generalizing $g$-$eta$-monotone operator cite{zhang}, $(a, eta)$-monotone operator cite{verma2}, $a$-monotone operator cite{verma0}, $(h, eta)$-monotone operator cite{fanghuang}, $h$-...