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.
What changes in the components of aggregate demand may shift the AD curve? - Changes in income - Changes in interest rates (If there is an increase in interest rates then there is likely to be less borrowing because it is more expensive to borrow) Therefore consumption will fall, resulting in a fall in AD.