Degenerative Compensation is a key theory proposed by philosopher Wang Dongyue in his book The Theory of Evolution. The theory posits that the more primitive and simple a species or entity is, the higher its degree of existence; conversely, the more advanced and complex a species or entity becomes, the lower its degree of existence. This declining trend in existential stability is referred to as "degenerative" (di rěi). To compensate for this decreasing degree of existence, later-stage entities develop new capabilities or structures to maintain their stability and continuity—this adaptive process is known as "compensation" (dai chang). In short, as things evolve, they become increasingly complex and fragile, and must develop new abilities to offset their growing vulnerabilities in order to survive.