One Nation Under Copyright: There are various forms of corporate-style governments found in the Associated Worlds – at least three distinct ones in the Empire alone.
The first of these is the governing corporation – a government which organizes itself along corporate lines. (A distinct feature of this type of corporate government is that the corporation exists solely to be a government, rather than being a corporation focused on something else that happens to govern.) The Empire contains quite a few of these, and indeed, is itself the largest – albeit an impure, the joint-stock corporation itself being in its infancy when it was founded – example of the type, hence the term citizen-shareholder, and the presence in the Imperial Couple’s style of Chief Executive Officers of the Imperium Incorporate. Another unusual constituent-nation example is the First Distributed Exclavine Republic, a confederation of Imperial exclaves run by a central Board.
(For the libertarians in the audience, one reason for this is that many of these, the Old Empires included, evolved out of PPLs or mutual-PPLs, themselves founded after the fall of the korásan and the Drowning of the People.)
The second of these is the corporate conlegial model, which exists to cover the large number of company-owned (or other privately-owned) but still Imperially-sovereign habitats or other enclaves, in which the responsibility to provide law/contract enforcement and other sovereign services on the Charter model is formally devolved upon the owning corporation’s Infrastructure and Security departments, thus saving a great deal of trouble where all the thousands of habitat-based office parks and research parks are concerned. The largest examples, of course, are the jointly-held corporate research planet Wynérias, the privately owned storage depository system Argyran, and the interlocking-collectives-of-Mad-Scientists-owned system Resplendent Exponential Vector.
The third is the corporate colonial model, in which those Imperially-chartered ecopoesis, colonization and development corporations that own entire planets under development are responsible for providing said sovereign services under Charter law on those planets until such time as they’re turned over to their actual final owners.
Variations on these three – essentially benign – models also exist elsewhere in the Worlds, as do some other less benign examples; in the Magen Corporate, for example, non-shareholding citizens are considered corporate assets in the literal sense, and the Chelzan Syndicracy is always fighting corruption in its mutual-conlegial model, but on average, corporate government tends to produce results no worse than any of the other kinds people try and use.