The most complete monopoly by the given list would be: (1) McDonald’s dominance in marketing fast food burgers. (2) the Federal Reserve System [i.e., an arm of the government] issuing all US currency. (3) limiting subsidized low tuitions at state universities just for in-state residents. (4) Caterpillar manufacturing all the heavy construction equipment made in Illinois. (5) Microsoft, that sells over eighty percent of all computer operating systems.
How can I solve my Economics problem? Please suggest me the correct answer.