What type of good is often provided by the government because it is hard to get people to voluntarily contribute their fair share of the expense?

Public goods

Explanation:

Public goods are often provided by the government because it is hard to get people to voluntarily contribute their fair share of the expense, they are goods or services that is often provided by the government and do not result in financial profit to anybody thus making individuals unwilling to partake in bearing the cost of such goods. Examples are street lights, flood control systems and national defense.

answer; when one group has an extremely high score at pretest;