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A rate is a relationship between two magnitudes . It's about a coefficient that expresses the relationship between a quantity and the frequency of a phenomenon . In this way, the rate allows to express the existence of a situation that cannot be measured or calculated directly.

The unemployment rate , for example, calculates the number of unemployed from the economically active population (those people that are in a position to be part of the labor market). In a region where 1,000 people live, if the unemployment rate is 10%, it does not mean that there are 100 unemployed, since if only 500 of them are economically active, the result would reveal that the number of unemployed people is 50 .

The interest rate , on the other hand, is the price of money and it indicates how much one must pay or collect to take a loan or transfer the money in a certain situation. In the event that a person applies for a loan of $ 20,000 with an interest rate of 25%, he must return $ 25,000 (the $ 20,000 of the loan plus $ 5,000 in interest).

If a subject deposits $ 15,000 in a fixed term that offers an interest rate of 5%, the investment It will represent a profit of $ 750. That is, when the term ends, you will receive $ 15,750 (your original investment plus interest).

In the field of demography and ecology, is known as population growth rate or of population growth to the index that represents the increase or decrease of the population of a given region over a particular period of time (usually one year). It is usually expressed as a percentage of inhabitants at the beginning of each period and is calculated taking into account two variables: the number of births and income of people from abroad; the number of people who have died or who have emigrated from the territory in question.

The overall fertility rate allows to estimate the quantity average of boys and girls that a hypothetical group of women would give birth throughout their fertile life if they did not suffer any disease or accident that threatened their health or the correct development of their children. Thanks to this and related studies, it is possible to calculate the ideal rate of children that a woman should have in order to comply with the population replacement level, which is currently 2.1. It should be clarified that this is an estimate based on a series of assumptions that have little to do with reality, such as that all inhabitants lived the same number of years.

In the world of computer science and telecommunications, there is talk of Bit rate or of transfer to define the amount of bits that a digital transmission system travels or that pass from one device to another in a given period of time, which returns the speed at which the information is transferred. A concept related to this term is the bandwidth, used massively when talking about Internet connections; The bit rate is nothing other than the actual bandwidth calculated at a particular time using defined Internet routes while a specific number of data is transmitted.

Given certain limitations and particularities of the connections, such as the distance between two nodes and the saturation of the net, the transfer rate is usually less than the theoretical bandwidth, especially when the number of users varies and the activities they perform cannot be controlled.

The rate, on the other hand, is a tribute that is imposed to access certain services or for the exercise of an activity. The person who is obliged to pay taxes, therefore, is a direct beneficiary.

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