Feedback loops at the systemic level can be positive, or negative. The system is likely to continually adjust to the loop, but may reach a critical state - a tipping point - and fundamentally change.
In 'The Education of a Speculator', Victor Niederhoffer, describes feedback loops:
Homeostatic Functions: One of the common features that all life possesses is a mechanism for maintaining orderly conditions. The tendency is called homeostasis. It is generally achieved through feedback loops.