The figure below shows the relationship of the quantity demanded for iTune music downloads per day to the price of each iTune music download. 
Definitions:
Segregation Of Duties
An internal control measure that divides responsibilities among different people to reduce risk of error or fraud.
Authorize
To give official permission for or approval to an action or plan.
Physical Controls
Security measures that are implemented to protect assets, including locks, surveillance cameras, and restricted access areas.
Segregation Of Duties
A risk management concept that divides tasks among different people to prevent fraud and errors in an organization.
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