I would submit that that would perhaps be a sign of a bad manager.
The purpose of management, in theory, is to (by whatever means) enable the people they manage to more efficiently create value for the company. Someone who would rather drive off a valuable employee by underpaying them instead of "manage" someone making more than the manager does is probably a manager in name only.
In general, it's almost always a bad sign when employees who don't directly create value for the company have ego issues directed at the value-creating employees (see also: power-mad HR or IT departments).
The purpose of management, in theory, is to (by whatever means) enable the people they manage to more efficiently create value for the company. Someone who would rather drive off a valuable employee by underpaying them instead of "manage" someone making more than the manager does is probably a manager in name only.
In general, it's almost always a bad sign when employees who don't directly create value for the company have ego issues directed at the value-creating employees (see also: power-mad HR or IT departments).