The society you describe has a very US-American Wild-West vibe to it:
allowing for financial speculation, investment and trading on an unprecedented scale.
Millionaires are made, fortunes are lost. Without the economic activity of this small elite, the budget would be in serious deficit - a truth they use to their political advantage.
Funded by the overflowing coffers of a consortium of billionaires,
Some of that description may be the old unreliable storyteller at work again.
Only time will tell if the growing unemployed population, comprising 50% of working age individuals, will endure the cost of these ideals.
Mandate: Halve proportional and absolute unemployment
Taboos: Construct no additional automation [auto mines] until full employment achieved.
I distinctly remember Steve writing that “available workers” does not equal “unemployed”.What it means is “available to be employed in ways that are meaningful to the empire”.
Of course that may have been on the old forum.
If somebody remembers where to find that article, a link would be much appreciated.
Taboo: Military ship count can never exceed civilian ship count
Cynics were quick to point out, that this says nothing about actual ship tonnage and it says nothing about what counts as a “ship” either.
Taboo: At least 50% of research output must be applied to military technologes
Has anyone ever violated that rule? My feeling is “no”
Mandate: Found new colony every 3 years.
Easy. Click “Create population” and ignore. 
Taboo: No industrial capacity (e.g. construction facilities) can be outsourced to any collonies.
I don’t see how this is going to end well with the Morrigi or indeed any of the offworld populations. For inspiration read any of Cherryh’s “Company Wars” novels.
Mandate: Double racial wealth. Always use private sector capacity [freight, colony] over public sector
Taboos: Never raise shipping taxes above 0%, never run budget deficit, never tax civilian mining
Reaganomics has survived. 
According to my reading the Future, Morrigi and (if you allow for “available” ≠ “unemployed”) Workers parties allow for the greatest amount of flexibility in steering the Starborn Empire to (duh) the Stars, so that is the coalition I will support.
The Astras can be tolerated in a pinch, the Abundancers have my personal loathing and the Firmas are actively destroying the nation.