How and why the pharmaceutical industry in the U.S. engages in practices

Discuss how and why the pharmaceutical industry in the U.S. engages in practices such as
production of me-too drugs, DTC advertising, disease mongering, and provision of free
samples and other stuff to medical doctors/students. Specifically, discuss the advantages of
each of these practices (from the viewpoint of the pharmaceutical industry and/or from the
viewpoint of others such as consumers and doctors) and why we should be concerned about
each of these practices.