There are economic statements which show the relationship between economic variables. It shows that a certain thing happens under given economic conditions. It regulates relationship in main economic activities of production, exchange, consumption and distribution.
Lionel Robbins defined economic laws as a statement of uniformity which govern human behavior concerning utilization of resources for achieving of unlimited ends. Example of economic laws is laws of demand and supply.
Therefore, economic laws show tendencies of what happens under given economic conditions thus they express people's reaction to economic forces. e.g. In the example about the laws of demand show that consumers tend to buy more as the price of commodity decreases and suppliers tend to supply more when the price of commodity increases.
Sometimes people believe contrary to the laws e.g. under given conditions of exceptional demand people with low-income demand more inferior goods at higher price that at lower price.