What are the "actors" of macroeconomics?

We know that macroeconomics is the study of the whole economy and its activities dealing with the decision making processes. We can include here the role of policymakers and government who are responsible for establishing monetary policy and fiscal policy (also known as the economic policies) for stabilizing money supply and price levels of products and services. We can also include here the role of central banks, government officials, legislatures and all others as an integral part of the macroeconomics.