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.
Aggregate demand is the total quantity of goods and services demanded in an economy at a given price level. If you plot the quantity demanded at each price level on a graph and connect the data points, you'll get what's called an aggregate demand curve. An aggregate demand curve is downward sloping.