Economics 19th Edition by Paul Samuelson William Nordhaus

Samuelson's text was first published in 1948, and it immediately became the 
authority for the principles of economics courses. The book continues to be the 
standard-bearer for principles courses, and this revision continues to be a clear, 
accurate, and interesting introduction to modern economics principles. Bill Nordhaus 
is now the primary author of this text, and he has revised the book to be as current and relevant as ever.