Answer:
equal participation in political life of all private citizens
Step-by-step explanation:
The public sphere is the place where people come together and discuss the societal problems through which political action is influenced. In a way it is a debate which gives the best solution to a problem then this solution is brought to the policy makers and the solution is enacted.
This idea is a key aspect of participatory democracy. The public sphere requires the public to speak and find solutions this cannot be achieved without the participation of people.