Here is a concept map about the principles of the economy. "He who wants something, something costs" to get something we have to give up another that we like, eg. In most of the wars in their last stages, when the food that the army keeps standing runs out, a choice is made between providing them with food or getting more weapons. “compared the costs and benefits to make decisions, many times the cost of one thing is renounced to the other thing. Ex. While you study at an institute, you lose the sense that you could see cattle working instead of training or the opposite. Learn more details from this concept map, or try to make yours with ease.