1)The three most important drivers of buyer power in the oil and gas market in the US 2019 are

2) A second major source of business information is "Marketline".This source provides significant additional information, particularly information related to industry analysis.Go directly to the following link in the UTSA Library (you may have to log in): https://advantage-marketline-com.libweb.lib.utsa.edu/Analysis/ViewasPDF/united-states-oil-gas-104913 .You will find a pdf file "MarketLine Industry Profile, Oil & Gas in the United States July 2020."Next, go to "6. Five Forces Analysis" to answer questions 7-12. The two most important Forces driving competition in the oil and gas market in the US in 2019 are

3)According to Investopedia https://www.investopedia.com/terms/s/supplychain.asp , "A supply chain is a network between a company and its suppliers to produce and distribute a specific product to the final buyer. This network includes different activities, people, entities, information, and resources. The supply chain also represents the steps it takes to get the product or service from its original state to the customer.Companies develop supply chains so they can reduce their costs and remain competitive in the business landscape." In what area(s) of the supply chain is NuStar Energy focused (referred to as "F" in Mergent Online)?