Define truth ? Why human beings speak truth ?

Explanation:

Definition: Saying a fact which is accept or proven to be true.

The reason why we speak truth is because it gives us a sense of security knowing that the spoken opinion is true. It also gives us better opportunities in life.

"All truth passes through three stages. First, it is ridiculed. Second, it is violently opposed. Third, it is accepted as being self-evident."  

- Arthur Schopenhauer

c. wright mills's sociological imagination suggest investigating to explain this increase?

answer; eliminate parking problems in cities, because a car took up only half as much space as a horse and buggy;