3. The next set of questions are based on an article titled "The Pitfalls of Economic Models" by Steven Pearlstein that was published in The Washington Post on November 15, 2015.

a) What powerful insight does the by model David Ricardo provide?

b) According to the author, what mistakes do economists tend to make in the way they treat model findings?

c) Evaluate the following statement in the view of the article: A good economic model is one that works for every situation.