English En
  • Deutsche De
  • English En
  • Français Fr
  • Русский Ru

We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our marketing and analytics partners who may combine it with other information you've provided to them or which they've separately collected from you. You also may to see our Privacy Policy. By clicking the OK button below, you accept our cookies.

Authors:

If a man were living in isolation his income would be literally his product. Make him the monarch and owner of an island, and the fruits that he raises and the clothing that he makes constitute, in themselves, his income. This ceases to be true when trading begins.

John Bates Clark