Introduction. During periods of instability, there is an interruption of the investment process and capital flight. On the one hand, this complicates the course of the phase of financial instability, and on the other hand, it makes the development of complex technological industries that require long-term financing impossible. The article shows the regularity of such a transmission of cyclical downturns in the strengthening of structural vulnerability of small open commodity economies using the example of Ukraine. In accordance with the change in the conditions of external commodity markets, they have a pro-cyclical effect, provoking the accumulation of structural vulnerabilities in the form of growth in budget expenditures and imports due to increased export earnings and investments in favorable phases of the cycle, and intensifying factors of instability in periods of recession. Materials and methods. The research used methods of theoretical generalization, abstraction, synthesis and deduction, statistical and economic analysis. Data from the World Bank and the National Bank of Ukraine were used as statistical series. Scientific publications and reports of international organizations in the relevant areas have been used. Results and discussion. The article shows that the fixation of the structural basis of the economy is an important factor in vulnerability. In this regard, one of the key factors in increasing cyclical and structural instability is uncontrolled exchange rate volatility. Procyclical strengthening of the national currency in favorable phases limits the profitability of exports and makes imports cheaper, attracts speculative capital, and encourages an increase in the budget deficit. In periods of instability, uncontrolled devaluation increases the negative effects of instability, provoking financial crises. Conclusions. In order to get out of such a closed circle of cyclical-structural vulnerability, it is advisable to introduce a policy of controlling capital flows and move to an intermediate regime of the exchange rate with a limitation of its pro-cyclical volatility.
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