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.
A: Supply and demand expresses a relationship between what producers supply and what consumers demand in economics. Aggregate supply and demand is the total supply and total demand in an economy at a particular period of time and particular price threshold. A curve is used to graph the aggregate supply and aggregate demand. These curves illustrate the relationships among price points, time, supply, and demand levels.