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Demand
1. One of the most important building blocks of economic analysis is the concept of demand. When economists refer to demand, they usually have in mind not just a single quantity demanded, but what is called a demand curve. A demand curve traces the quantity of a good or service that is demanded at successively different prices.
2. The most famous law in economics, and the one that economists are most sure of, is the law of demand. On this law is built almost the whole edifice of economics. The law of demand states that when the price of a good rises, the amount demanded falls, and when the price falls, the amount demanded rises.
3. It is not just price that affects the quantity demanded. Income affects it too. As real income rises, people buy more of some goods (which economists call normal goods) and less of what are called inferior goods. Urban mass transit and railroad transportation are classic examples of inferior goods. That is why the usage of both of these modes of travel declined so dramatically as postwar incomes were rising and more people could afford automobiles.
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Law and economics are so close that they solve the same problems in political economy, constitutional economics and political science.
Legal problems can always be solved by the methods of economics, like political and scientific questions.
Law and economics are close when lawyers talk about influence of economic methods on legal problems.
Some issues in economics and law can coincide in such spheres as political economy, political science and others.