1. Introduction

Nowadays, due to globalization is very important to consider the factors which affect the value of money throughout the time. About these factors, we can mention the following: permanent changes or movement in the interest rates from different countries, which constitute a reference for the country, exchange rate, inflation and other factors involved in the valuation of several currencies.

Based on this information, several studies have addressed the topic of financial education, whose purpose has focused on assessing the level of financial literacy in the population. Regarding this, it is important to define financial literacy as "the way of acquiring knowledge and develop skills that we all need to make better financial decisions and thus, be able raise the level of social welfare in each of the stages of our life "(CONDUSEF, 2012).

Now if we consider the assumption that establishes "To higher financial knowledge, best financial decisions", several studies have shown that, an adequate financial education allows people to increase their savings (Bernheim and Garrett, 1996; Bernheim, Garrett and Maki, 2001; Clancy, Grinstein-Weiss and Schreiner., 2001; Moore et al 2001), to make lower interest payments by late payment (Hirad and Zorn 2001) and to the debt reduction (Elliehausen, Lundquist, and Staten, 2007).

The implementation of financial literacy programs has been mainly focused on promoting knowledge related to savings, the effect of inflation, personal finance planning and management of financial products and their implications of those products (Vitt et al, 2000). Similarly, the programs have focused on promoting awareness among population about the effects caused in long-term, over-indebtedness in their heritage (Cohen and Sebstad, 2003).

There are several studies that show deficient level of financial education in the population, for example, we can talk about the study conducted by Rooiji, Lusardi and Alessie (2011) in Holland, in a sample of two thousand households. This study showed that, the low level of financial literacy in the population, has caused uncertainty in people to invest in the stock market, thereby generating, lack of diversity regarding financial risk in their savings, and therefore, the people cannot get a higher return on their assets, as not widely used financial instruments offered by banks and financial institutions.

Similarly, among studies that have been done in Mexico, in March 2008, the Universidad Nacional Autónoma de México (National Autonomous University of Mexico, UNAM) in partnership with Banamex, carried out the first survey about Financial Culture in Mexico; the results showed that there were gaps in financial literacy, educational backwardness in financial matters (mainly rural population and lower educational sectors and socioeconomic status), an absence in the planning of personal finance, lack of control of expenditure, income and debt; lack of savings and no knowledge regarding the calculation of interest rates (UNAM, Banamex, 2008).

Certainly, regarding the topic of financial education is very important to talk any time about their: progress, achievements, weaknesses, gaps, failures and all that surrounds this phenomenon of study, however, is during times of crisis, when it should give more importance to the aspects of financial education. We should use the evidence which has been obtained which has been reported in several studies about those lags or remaining gaps in financial education, be able to set, plans or actions to follow, in order to propose advice on what to could be done in case of: the household debt or unexpected losses in the value of their financial assets, all this, due to the inadequate selection of financial instruments without a prior analysis of their needs and possibilities.

In this sense, it is very important to encourage –in the economically active population- a savings culture as a way of prevention and become in habit, as a medium to achieve goals, both personal and family (Carrillo, 2008).

On the basis of the need to expose the impact of interest rates on regular saving, we present a financial modeling in one case of investment in a year:

2. Statement of Problem

In Mexico there has been a common practice in the culture of savings relative to investment or savings in several families of the population. On this practice gets used withdraw dividends earned in each period, i.e. does not reinvested. But, what happen if the interest earned are reinvested? In a hypothetical scenario in which saver (regularly a person who saves money through a bank) has the habit of depositing constantly to increase investment, should also get used to reinvest dividends earned and thereby, at the end of some period, be able to reach accumulate a greater amount as a result of this new practice of saving.

Is for the above mentioned that we propose an investment scenario to one year, with interest floating rate. To do this, we utilized the interest rate called TIIE 28 days, which it is referenced by Banco de México. To developing our model, we use the formula of anticipated annuities with reinvestment in different times, and its capitalization is similar to the frequency of deposits. In the first place, the interest rate TIIE (28 days) becomes at its effective rate starting from the following formula:

(1)

Where:

TIIE: 28-day (is the reference interest rate proposed by Banco de México)

Te= Annual effective rate,

i_tiie= 28 days TIIE rate,

n_t = period of investment,

m_c= type of capitalization,

To obtain i_{tiie monthly} =

Time line of anticipated annuities:

(2)

Where:

FV= Future value,

P_q= Periodical quote or rent,

i_er= effective interest rate,

m_c= capitalization,

n_t= period of investment

After to calculate the next value (FV₂) we use the next formula:

(3)

Where:

FV₂= Future value two, FV₁= Future value one, P_q= Periodical quote or rent, i_er= effective interest rate, m_c= capitalization, n_t= period of investment

And so it goes…….:

(4)

Where:

FV₃= Future value three, FV₂= Future value second, P_q= Periodical quote or rent, i_er= effective interest rate, m_c= capitalization, n_t= investment period

To do this, we considering the next data:

Table 1. Data to financial modeling

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Firstly, we should become the interest rate TIIE to effective interest rate, to do this; we utilized the formula (1)

(1)

(1.1)

Table 2. TIIE (interbank equilibrium interest rate)

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The rest of effective interest rate TIIE (28 days), we show in the next table:

Table 3. Effective rate TIIE

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Once we have effective interest rates, we can calculate the future values for the 12 months as follows:

(6)

(6.1)

(7)

(7.1)

(8)

(8.1)

(9)

(9.1)

(10)

(10.1)

(11)

(11.1)

(12)

(12.1)

(13)

(13.1)

(14)

(14.1)

(15)

(15.1)

(16)

(16.1)

(17)

(17.1)

3. Conclusions

The total amount that will be received at the end of the investment, will be $12,225.58; less $12,000.00 corresponding to all the deposits made throughout of the year, so, we would have $225.58 which correspond to interest accrued during one year of investment, therefore, we may say that average interest rate is a 1.8798333% ($ 225.58 / $ 12,000.00)

As we can see, the mathematical model proposed to evaluate an investment project allow to make decision among different proposals of investment, which offer the Sistema Financiero Mexicano (México)

Following the theoretical implications, we can see in a study conducted by Bernheim, Garret and Miki ( 2001), who demonstrated that having an adequate financial literacy, allows to the population to increase in a higher proportion their savings, considering if the people know evaluate the effect of interest rates on savings or investment project.

References

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[2]	GARCÍA-SANTILLÁN, A., and Vega-Lebrún, C. (2008): Reestructuración de la deuda mediante un factor común y la modelización con ecuaciones equivalentes [Debt restructuring through a common factor and equivalent equation modeling]. Contribuciones a la Economía, abril 2008.
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