Macroeconomics deals with models of an entire economy, that is, with scenarios capable of generating and explaining broad magnitudes such as employment and unemployment, national product, and the price level. Macroeconomics endeavors to explain not only why these and similar economy-wide variables have a particular magnitude at any moment but also why they change as they do. Most of these variables are recorded regularly in tables such as the National Product and National Income Accounts, and, in a sense, macroeconomic analysis brings to life the accounting frame work of these tables.