Historians often emphasize socioeconomic causes when describing the fall of the Roman republic, which began centuries before Augustus won the civil wars. For example, the sudden influx of wealth and slaves, uprooting of the peasant agricultural class, rapid urbanization, the poor treatment of the legions, urban unrest over grain, the financial corruption of the elites, etc.
By contrast, I've usually seen the end of Athenian democracy as a series of contingencies, driven by chance events and personal actors: Athens is crippled by the Peloponnesian War and the plague, and then Philip II and Alexander lead Macedon into Greece.
My question is, can one give a good account of the decline of Athenian democracy, in the approximately hundred year span between the Peloponnesian War and conquest by Macedon, that explains it in terms internal systemic socioeconomic weaknesses, building over time, comparable to though clearly not the same as the above example of the decline of republican Rome? What, at least in a brief sketch, does such an account look like?
I've edited this question to narrow the scope, and give brevity and clarity.