Respond to the following in a minimum of 175 words: the aggregate

Respond to the following in a minimum of 175 words: 

The aggregate demand and the aggregate supply model allows us to examine how a variety of events can affect the economy.

In your own words, discuss which of the four sources identified with aggregate demand has caused a change in the aggregate demand for a product or service you or your employer use. Share the effect that source has had on how you or your employer contribute to the measurement of aggregate demand.