Compose an essay of no less than 500 words discussing the topics covered in this unit. Your essay should include the following: 

• Describe at least three public goods provided by public institutions and how these public goods impact society domestically and/or internationally. 
• Discuss how demand and supply of public goods is influenced by external, environmental, economic, and political factors. 
• Discuss Arrows impossibility theorem, and give an example of how it can affect the political process, other than the example discussed in the unit lesson and the textbook. 

You must use at least one scholarly source