Stakeholders in ther broad sense are anyone who is directly or indirectly impacted by a project or intiaitive, such as a currency system.
In the narrower sencse, any person, institution, or organization that has a vested interest in the project or initiative is talked about as a stakeholder.
Usage in CCs
Stakeholders, in the narrow sense, of a CC systems, can include organizations, local businesses, municipal governments, economic development associations, etc.
In the broader sense, also individual users or even those that are not actively participating can be classed as stakeholders.
Each system or project in its own geographical and social circumstances will have a unique combination of stakeholders, whose values and desires should be taken into account during the design and governance and operation of that system.