Carl Menger wrote in the Preface of his 1871 book "Principles of Economics," which later became the foundation of the so-called Austrian School of economic thought:
It makes you think -- it was written 136 years ago, and yet it remains so relevant today. Indeed, it feels like 1871!
I tried to say the same thing in my earlier post "Does the Long Term Matter?" but I could not be as concise as Menger. So, if you have not read this relatively short book yet, you should. Or at least, read the first chapter "The General Theory of the Good." The Ludwig von Mises Institute offers a free PDF version here.