а) Whаt аre the three main types оf ecоnоmic evaluations used in healthcare, and how do they differ from one another? For each, explain each in detail and how outcomes are measured and how this affects the type of decisions these tools are used to support. Emphasize how they differ in terms of their applicability and the kinds of comparisons they allow. b) Why are economic evaluations important in the healthcare sector? Explain the purpose of conducting economic evaluations in health care. Include how these evaluations can support decisions about resource allocation, coverage policies, or treatment guidelines. c) What are the advantages and disadvantages of using economic evaluations in healthcare decision-making? Explain both the advantages and disadvantages. d) Why has the United States been reluctant to fully adopt cost-effectiveness analysis, and how does this compare with practices in other countries? Describe how other countries have used economic evaluations to guide national health decisions. Based on your readings, evaluate whether these approaches are effective and whether they could be adopted more widely in the U.S.