Why was the book principles of economics written?
a) to outline how the american economy would be managed in the future
b) to create and shape modern macroeconomics
c) to discuss how america could become a successful economy after world war ii
d) to connect the classical and modern economic theories

The book Principles of Economics was written to create and shape modern macroeconomics. The correct option among all the options that are given in the question is the second option or option "B". The Principles of Economics was written by Alfred Marshall.This book was first published in the year 1990. I hope it helps you.