â¢ Wait three to four weeks before lifting heavy objects or doing strenuous exercise. Get clearance from your doctor before very strenuous activity or manual labor. If you underwent angioplasty to stop a heart attack, your doctor may ask you to take a stress (treadmill) test three to six weeks after your procedure.
Aggregate demand, or AD, is defined as the total amount of goods and services consumers are willing to purchase in a given economy and during a given time period. Sometimes aggregate demand changes in a way that alters its relationship with aggregate supply, or AS; this is called a shift.. Since modern economists calculate aggregate demand using a specific formula, shifts result from changes in the value of the formula's input variables.
In the Keynesian framework, aggregate demand is the sum of consumption demand, investment demand, government demand for goods and services, plus net exports. Aggregate supply is simply total output -- gross domestic product â the total production of goods and services in the economy. Both aggregate demand and aggregate supply are depicted as curves, with the price level on the vertical axis and income and output on the horizontal axis.