*Abstract*

*Object:* to assess of the interdependence and mutual influence of the exchange rates of the RUB and USD against the tenge before the COVID-19 and during the period of its impact on the Kazakhstan`s financial market.

*Methods:* the main research methods are regression modeling, the least squares method, analysis and generalization of methodological approaches of authors assessed the influence of various factors on the exchange rates of countries.

*Findings:* the COVID-19 introduced uncertainty in the formation of exchange rates of the RUB / KZT and USD / KZT. The strong direct relationship between the RUB / KZT and USD / KZT, which existed before the pandemic, as a result of the impact of COVID-19, was replaced by a negative and weaker correlation dependence.

*Conclusions:* the impact of the pandemic on the exchange rates of the ruble against the tenge and the dollar against the tenge is ambiguous, which reduces the degree of mutual influence of exchange cross-rates between the ruble and the US dollar even in countries that closely interact with each other. Further research is required to identify the factors that contributed to this change in the interdependence of the ruble / tenge and dollar / tenge.

**Introduction**

At present, the exchange rate is one of the fundamental factors indicating the state of the financial market, the country's competitiveness, and the financial security of the state. That is why the problems of currency regulation are becoming central and riveting the attention of both government bodies and financial market participants in general.

Strengthening the integration processes in the world financial market has led to an increase in the importance of the influence of external factors on the foreign exchange market of Kazakhstan: world prices for energy resources, investor expectations, volatility of world currencies. The instability of the world financial system, exposure to the influence of many external factors requires research into the issues of exchange rate volatility in Kazakhstan.

Since Russia remains one of the main strategic and trading partners of Kazakhstan, changes affecting the Russian market are directly reflected in our country, which also affects the formation of the exchange rate of the tenge against the Russian ruble. Moreover, it should be borne in mind that both countries are influenced by the same external factors, for example, oil prices, foreign policy, dependence on the US dollar. Of course, we are not talking about a one hundred percent correlation between the Russian ruble and the Kazakhstani tenge. However, a close connection can still be traced.

Since the tenge is closely dependent on the US dollar, it becomes necessary to study the relationship and the degree of influence of American financial policy on the exchange rate of the Kazakh national currency. This need is also intensified due to the fact that the pandemic had a significant impact on the development of the economies of all countries of the world, since the exchange rate ultimately has a significant impact on macroeconomic indicators: from inflation to the balance of payments. As a result of this influence, it

Hypothesis 1: if we consider the tenge as the base of assessment, then based on the study of the correlation between the tenge and the ruble and the tenge against the US dollar, it is possible to assess the degree of interdependence of the RUB / KZT and USD / KZT exchange rates.

Hypothesis 2: the presence of a relationship between exchange rates allows us to determine the forecast intervals and elasticity of exchange rates in relation to each other.

Hypothesis 3: since the pandemic had a significant impact on the economies of the countries of the world, it also made appropriate adjustments to the correlations between the RUB / KZT and USD / KZT exchange rates.

*Literature Review*

For a long period of time, the issues of the exchange rate, the assessment and analysis of the influence of various factors on it have been considered by many authors. At the same time, various statistical and econometric methods of analysis were used. Most of the works examined the influence of macroeconomic factors on the exchange rates of individual countries. At the same time, there are works of a more global nature, covering studies of several countries.

Thus, Twarowska K. and others (Twarowska, 2000) analyzed the main factors determining the exchange rate of Poland against the euro. The analysis showed that the balance of payments deficit, inflation rate, interest rate and government deficit are the most significant factors influencing the exchange rate..

Sh.Parveen, A.Qayyum and Kh.M. Ismail applied a simple linear regression model with the usual leastorder method (OLS) to analyze the factors affecting the viability of the exchange rate in Pakistan (Sh.Parveen, A.Qayyum and Kh.M. Ismail, 2012). According to the results of the analysis, it was revealed that inflation is the main factor, the second important variable that leads to a greater change in the exchange rate is economic growth, and the order of exports and imports in variations is in the third and fourth positions.

V. Dodonov considered the relationship of the tenge exchange rate with oil prices and the Russian ruble exchange rate, analyzing the dynamics of key items of the balance of payments of Kazakhstan in order to identify the most closely correlated with the tenge exchange rate current transactions and financial account items (V, Dodonov, 2014).

Ramasami R. et al. Evaluated the impact of macroeconomic variables on exchange rates of three different countries using the bootstrapping method. The results showed that psychological factors predominated in economic variables affecting exchange rates (Ramasamy, R., 2015).

G.R. Oganesyan considered the relationship between the ruble exchange rate and key macroeconomic indicators in Russia through statistical and econometric analysis, as a result, confirming the strong dependence of the ruble exchange rate on oil prices (G.R. Oganesyan, 2016).

Vidyavati, B. et al. Assessed the main macroeconomic indicators affecting the exchange rate. The analysis revealed the presence of a negative relationship between GDP, inflation, interest rate and external debt with the exchange rate (Vidyavathi, B., 2016).

Sheetal Maurya examines the impact of various economic variables on the exchange rate of India's national currency against the US dollar. The analysis revealed a close relationship between imports and the exchange rate between the rupee and the US dollar (Sheetal, 2017).

During a pandemic, the issue of the exchange rate is also of interest to various authors. In particular, studies by some authors show that the effectiveness of foreign exchange markets is difficult to assess (Katusiime et al., 2015), and it is quite difficult to identify any clear pattern of changes and the effectiveness of exchange rates, but it can be tracked especially during crisis situations (Levich et al. al., 2019). The authors also investigated the impact of the Covid-19 pandemic on exchange rates in Turkey, the results of which showed that the emergence of new foci of the disease causes uncertainty in the economy, which leads to significant fluctuations in the exchange rate of the Turkish national currency against other currencies of countries (Eda Dineri et al. , 2020).

Hoffman et al. stated in their study that the Covid-19 epidemic has enlarged and complicated the markets of emerging market economies, especially in developing countries (Hoffman et al., 2020). In his study, he found that the dynamics of capital flows during the pandemic increased the negative impact of high credit margins on domestic exchange rates (Kouma, H., 2020).

Aslam et al. Applied multifractal analysis of fluctuations without a trend (MF-DFA) to assess the performance of foreign exchange markets during the initial and ongoing period of COVID-19, which brought down the global financial markets (F.Aslam, 2020). At the same time, the issues of mutual influence of currency pairs that have a powerful impact on the development of the country's economy have not yet been considered. This is especially true for Kazakhstan.

*Methods*

Regression analysis was used as the main method of analysis, to estimate the parameters α and β of which the least squares method (OLS) was used. The elasticity coefficients and confidence intervals of the currency forecast were also estimated. In order to compare the behavior of currency pairs before the pandemic and as a result of the impact of COVID-19, the time period for the study was divided into two parts: until 2019 and from 2019 to the present. Regression analysis was carried out for each interval separately.

Regression analysis is used to visualize the form of the relationship between the studied economic indicators. The set of points of effective and factorial features forms a correlation field, on the basis of which it is possible to put forward a hypothesis about the presence of a linear relationship between all possible values of X and Y (I.M.Borkovskaya et al., 2018)

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Bulletin of the Karaganda University

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Bulletin of the Karaganda University

Model B data allow you to bui**l**d a scatter diagram (Figure 2).

Thus, on the basis of regressio**n **models, data were obtained on the mutual infl**u**ence of the RUB / KZT and USD / KZT currency pairs bef**o**re the COVID-19 pandemic and during the per**i**od of its action and impact on the financial markets of the **c**ountries of the world.

*Discussions*

The analysis shows that the pandemic has made its own adjustments in the ex**c**hange rates of the tenge against the ruble and the US dollar, as well as in the degree of their interdependence. In Figure 2, the change in the influence of currency pairs in model B is obvious.

The results of evaluating mod**e**l A show that in the studied situation, 95.01% **o**f the total variability in USD / KZT is explained by the cha**n**ge in RUB / KZT. It was also found that the par**a**meters of the model are statistically significant. In the peri**o**d before the pandemic, the impact of RUB / **K**ZT on USD / KZT was much more significant. Thus, the **a**ssessment of the dependence of these currency pairs showed that if the exchange rate of the tenge against **t**he ruble changes by 1%, the exchange rate of **t**he tenge against the US dollar will change by more than 1%. The obtained estimates of the regression equation allow us to determine the forecast boundaries in the period before the pandemic. So, if the tenge / ruble rate were 6, then the tenge / US dollar rate would be in the range from 344.66 to 427.08 tenge and with a 95% probability would not go beyond the specified limits.

However, the impact of the pandemic on the dependence of exchange rates has led to certain changes. If earlier the growth of the exchange rate of the tenge against the ruble led to an increase in the exchange rate of the tenge against the US dollar, now the RUB / KZT currency pair does not significantly affect the USD / KZT currency pair, that is, if the exchange rate of the tenge against the ruble increases by 1%, the exchange rate tenge against the US dollar will decrease by less than 1%. Thus, with a unit value of 6 tenge, the US dollar will be in the range from 408.52 to 425.83 tenge and with a 95% probability it will not go beyond these limits.

At the same time, the degree of dependence of these exchange rates decreases. If before the pandemic the correlation coefficient was 0.97, that is, it showed an almost absolute, moreover, positive correlation, then as a result of the influence of the pandemic, the correlation coefficient decreased to 0.5, and with the reflection of the inverse relationship.

*Conclusions*

The results obtained allow us to confirm the hypotheses put forward earlier. In particular, if we consider the tenge as a base of assessment, then based on the study of the correlation between the tenge and the ruble and the tenge against the US dollar, one can estimate the degree of interdependence of the RUB / KZT and USD / KZT exchange rates. Indeed, the assessment showed the ruble's dependence on the US dollar.

The presence of a relationship between exchange rates allows you to determine the forecast intervals and elasticity of exchange rates in relation to each other. As a result of the analysis, it was determined how the exchange rate of the tenge against the US dollar will change if the ruble rate is 6 tenge in the period before the pandemic and as a result of its impact on the financial market of Kazakhstan.

Since the pandemic had a significant impact on the economies of the countries of the world, it made corresponding adjustments to the correlations of the RUB / KZT and USD / KZT exchange rates. As the analysis has shown, the correlations between these exchange rates have changed significantly: the dependence has become weaker and negative.

Thus, the analysis performed allows us to show that the impact of the pandemic on exchange rates is ambiguous, which weakens the degree of mutual influence of exchange rates on each other, even in closely interacting countries. This analysis requires further research on the factors that had such an impact on the relationship between the RUB / KZT and USD / KZT exchange rates.

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