Economics research paper help needed! Need to write an 15 pages double space literature review on price discrimination in certain industry.    Guideline...

Economics research paper help needed!

Need to write an 15 pages double space literature review on price discrimination in certain industry. 

Guideline provided by the professor :

Select a firm practice that interests you. In preparation for undertaking the research, you should evaluate the industries and major firms to which this practice appears to be important. Compare and contrast: why is this practice more prevalent in one industry than another? Why does firm X adopt this practice more than firm Y?

For a theoretical study, write a literature review on the recent models proposed by academic economists to explain some aspect of the chosen firm practice

The practice I want to write about is price discrination, and I prefer writing reviews on gasoline industry.