Why did I love this book?
If you know only little about the subject, this is where to start.
A brilliant survey of the main thinkers, from Smith via Marx to Keynes, it surveys the era of political economy, when economists pondered how to make life better for all.
Not always correctly, not always in good faith, but their thinking formed our understanding of the world.
While you are at it, get the flavour of the real thing, Adam Smith’s Wealth of Nations (1776, find Edmund Cannan’s edition, still in print or secondhand) – the best book in economics and one of the greatest ever.