Suffrage as in franchise? The right to vote? Or to be a candidate? are you referring to Women's Suffrage?

They have lower costs (in and of itself, or because they have established distribution systems that lower costs), or expereince complementarities with other products in their line.

Initially it was hereditary kings, replaced by oligarch aristocrats who shared places on the ruling council, then in democracies by citizens who formed the assembly and councillors and magistrates appointed by their tribes.

The word initially is indeed an adverb, yes.

An example sentence is:
We were initially very excited about the trip.

Initially it was hereditary kings, replaced by oligarch aristocrats who shared places on the ruling council, then in democracies by citizens who formed the assembly and councillors and magistrates appointed by their tribes.