Assumption Ceteris paribus this assumption is handled in economics when an economic model is used to study several variables and one is used and the rest of the variables remain constant, the important thing in the economy is how it describes a market where bidders who offer goods and services, and the plaintiffs who are the consumers that are what they participate in a market in a certain time, giving to play the law of demand so simple is to buy or demand goods and services at the lowest possible price in a market in a certain time, the demand curve shows us how they are the possible combination at the different price levels that quantity of goods and services we can acquire according to our purchasing level available to buy, in such a way that it serves as the basis for establishing economic policies to stimulate production and increase the GDP of a country or nation. That the size of the market and the price levels set for a good already finished in its manufacture could influence an economy, there is a negative relationship between the quantity demanded of a good and its price, it is also evident that the factors that remain Constant in this relationship are the prices of other goods and the consumer's income.
Determinantes de la demanda:
1-Precio de los bienes y servicios.
2-Gusto y preferencia del consumidor.
3-Tamaño del mercado.
Modelos gráfico y matemático.
Graphical and mathematical models.
A graphical representation of the law of Demand, where the analytical and mathematical analysis is shown, which shows us the dependent and independent variables of a good or service in the quantity and price relationship, Q : quantity, P: price, the curve shifts according to the determinants of demand to the right or left in the economy market in a given time. It can also be mentioned a set of goods or services that consumers are willing to purchase at each price level, keeping the rest of the variables constant, it is also defined as a request to purchase a title, currency or service, generally the amount claimed for some good increases with a decrease in the price of the good and vice versa.
[1]-Contemporary economics by Milton H. Spencer, 1993.