People who are thinkers understand that some things can never be known with certainty, but they also understand that some judgments are more valid than others.

REFLECTIVE

Explanation:

Reflective thinkers focuses on the process of making judgments about what has happened by determining an individual's strengths and weaknesses and by allowing individuals to question values and beliefs, recognize biases, acknowledge fears, and find areas of improvement.

Reflective thinkers are aware of one's own knowledge, assumptions and past experiences.

Reflective thinkers considers their personal achievements and failures and asks what worked, what didn’t, and what needs improvement.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.