In this country, what proportion of all businesses are

(a) proprietorships,

(b) partnerships,

(c) private companies, 

(d) public companies? 

Provide an example of an industry that has a large share of proprietorships. Why is this the case? Provide an example of an industry that has a large share of partnerships. Why is this the case? Provide an example of an industry that has a large share of private companies. Why is this the case? Provide an example of an industry that has a large share of public companies. Why is this the case?