The purpose of market segmentation is to introduce a tailored message that will be received successfully. This is advantageous for companies that may have a product or service in the marketplace that boasts multiple benefits or uses for different types of customers. In view of this: 

a) Identify and explain any FOUR (4) of the variables under demographic segmentation. 

b) Using an example to illustrate, explain what is meant by the following terms: 

i. Undifferentiated Marketing 

ii. Differentiated Marketing 

iii. Concentrated Marketing