The concept of **curve** It can refer to a line that allows the development of the graphic representation of a magnitude according to the values that one of its variables takes. In the field of economics, on the other hand, the idea of **demand** It is linked to the quality and quantity of services and goods that can be purchased by consumers in the market.

The **demand curve** , in this framework, is the line that graphs the mathematical link between the **maximum amount of a certain good that a consumer would be willing to acquire** and his **price** . This relationship is based on various assumptions, such as the infinite divisibility of goods and the perfect rationality of consumers.

These last two assumptions, together with others on which both the demand curve and its properties depend, have led to negative criticism since its emergence. Despite this, even with the limitations that may arise from these abstractions, this curve is really useful for understanding the **behavior** of markets from a qualitative point of view, and can be an empirically adequate description.

Beyond being a theoretical construction, the demand curve is used for the **market analysis** , usually in conjunction with the call **supply curve** (determined by the quantity of a product that a company is willing to sell at a certain price). The point where the demand curve intersects with the supply curve marks the **Balance** From the market.

Both curves represent a tool of analysis of great importance in the field of **economy** Neoclassical to predict the price trend. It is known as **neoclassical economy** to a concept that is used to refer to an approach that seeks the integration of certain perceptions of the classical into marginalist analysis, a school of thought that emerged in the mid 1800s.

To draw the demand curve, only the **price** of the good in question. The rest of the variables, such as the price of other goods and consumer income, were considered **constants** . In this way, the demand curve reveals the changes in the quantity demanded according to the price.

As usual, **at a higher price, lower demand** : That is why the demand curve usually has a downward trajectory. This situation could be modified if others were met. **variables** , like the perspective on the future price, the increase of the population that demands the good, the changes in the wages and the modifications of the preferences.

Speaking in purely mathematical terms, the demand curve of a market or a **consumer** who owns an amount *n* of products or goods is a hypersurface with a dimension *n* in a space that is defined as *R* raised to **2n + 1** . It is known as *hypersurface*, in the field of mathematics, to a variety *n*-dimensional, being *n* greater than 2; in other words, it is a geometric object created to generalize a surface of two dimensions to more, as it happens with the hyperplane and the notion of plane.

If the demand curve moves to the right, it represents an increase in demand that occurs because a factor other than price has varied; if he **displacement** it takes place to the left, on the other hand, it means that demand has decreased, due to a variation that does not involve price either.

Among the possible causes of these displacements are changes in the prospects of future prices, the growth of the population that demands the **good** in question and variations in the preferences of potential consumers.