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.
For example, if aggregate supply is growing at 3% per year (equal to 1% growth in the labor force plus 2% growth in worker productivity), then the Federal Reserve would like to maintain aggregate demand growth at an equivalent rate.Figure 7-12 illustrates this point.he aggregate supply curve shows the total output by producers of all goods and services in our economy. Note that the aggregate supply curve has a relatively flat region that rapidly becomes vertical. The flat section of aggregate supply is characterized by an economy with a good deal of excess capacity or slack.