When economists study aggregate supply and aggregate demand, what are they studying?

the supply and demand of a good produced by one company
the total supply and demand of goods produced at all price levels
the equilibrium price of one good that is produced
the reason for a decrease in supply and demand for a specific good

How was the appointment of two consuls during the roman republic an example of a democratic principle? one consul represented patricians and one represented plebeians, so that all citizens had representation each consul had control over the same number of military legions, which prevented either one from a forceful takeover. consuls had to agree on all decisions, which prevented any one person from gaining too much power. consuls had to make decisions based on majority rule in the senate. quickly