The duopoly hoards resources
The two parties divided and hoarded The five key inputs to political competition. It is unattractive or otherwise infeasible to work for a non-duopoly force.
Furthermore, The duopoly co-opted the media..
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The duopoly hoards resources
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The duopoly works well together to insure competition is kept out
In fact, the duopoly works very well together to make sure this doesn’t happen. Elections are rigged against competition and The duopoly hoards resources.