How can a government try to keep transactions in the marketplace fair?

American Capitalism: Moral or Immoral

Build a case that a structural system that allows for Bill Gates to earn $2 billon a year while millions of people live under the poverty line is ethically justified.
Build a case that such a system is ethically unjustified.
What are the conditions under which free enterprise is morally defensible?
What are the conditions under which a transaction is supposed to be fair?
Provide an argument that meeting those conditions does make a transaction fair.
How can a government try to keep transactions in the marketplace fair?
Is it the job of a government to make sure transactions in a marketplace are fair? Why or why not?
Is taxation morally justified? Is so, why? If not, why not?
The Marxist claims that capitalism is based on exploitation. What is his or her argument for this?
Define “exploitation”.
Define “alienation”.
The Marxist claims that capitalism alienates human beings. What is his or her argument for this?
What is the argument that capitalism creates gross and unjust inequalities of wealth?
Are all gross inequalities of wealth morally unjust? Why?