  In economy, viewed as a quantum system working as a circuit, each process at
the microscale is a quantum gate among agents. The global configuration of
economy is addressed by optimizing the sustainability of the whole circuit.
This is done in terms of geodesics, starting from some approximations. A
similar yet somehow different approach is applied for the closed system of the
whole and for economy as an open system. Computations may partly be explicit,
especially when the reality is represented in a simplified way. The circuit can
be also optimized by minimizing its complexity, with a partly similar
formalism, yet generally not along the same paths.
