Why does an economist create a market demand curve? to show how various conditions can change the demand for a good to predict how people will change their buying habits when prices change to learn what demands the market will make under unusual conditions to have an idea of how a market would change if conditions in an area changedthe answer is b

The answer is to predict how people will change their buying habits when prices change.  The definition of a market demand schedule is, it is a table of the number of a good that all consumers in a market will buy  at a given price. So when there is a change in price, you will know what will be the demand for those products - you will know what their buying habits are if they buy even the price or vice versa.

Athena (goddess of wisdom) gave perseus an unlikely tool to defeat medusa that requires brain over brawn that was instrumental in his victory against medusa

Mary the first aka bloody mary was catholic