How to solve various problems with economic assumptions?

In fact, many of the productive forces that Marx talked about are the conditions of productive forces, and his historical materialism is flawed. Obviously, the problem of production relations is the basic problem of production (production relations include economic relations between people in production and technical relations with natural nature (management level is actually a management technical problem, but management technology and technical relations with natural nature also include technical problems involving social attributes in interpersonal relationships). The production here is mainly narrow, but it is also established in a broad sense. The specific organization and management of production can not be solved by a contract (because, according to the basic assumption of western economics, people are economic people and contracts cannot be complete).