Why fuel prices fluctuate

Read the two articles below that discuss why fuel prices fluctuate. Research two of these types further.  

2. Locate two JOURNAL articles which discuss this topic further. You need to focus on the Abstract, Introduction, Results, and Conclusion. For our purposes, you are not expected to fully understand the Data and Methodology.  

3. Summarize these journal articles. Please use your own words. No copy-and-paste. Cite your sources.