Could someone please answer these questions? Thanks!

Essay Questions: (10 points each) Answer only FOUR of the following six questions. 21. Small countries that are allied with the United States tend to spend a smaller share of their national income for national defense as compared with the United States. Provide a plausible explanation for this situation. 22..Briefly explain why the private market might fail to allocate resources efficiently in the following cases: a. Contributions to a charity to fight cancer. b. Inoculation against contagious diseases. 23. Distinguish among the following three terms: public goods, public provision, and public production Classify primary education in the U. S. in regard to these terms