The drivers of volume volatility: A big data analysis based on economic uncertainty measures for the Greek banking system

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In this paper, an investigation is conducted to estimate the effect of economic uncertainty on volume volatility, focusing on four systemic Greek banking institutions, including (i) Alpha Bank, (ii) Eurobank, (iii) National Bank of Greece, and (iv) Piraeus Bank. The purpose of this study is to explain in detail if the EPU is linked with volume volatility in the largest banking institutions in Greece. For the analysis of this paper, data used are monthly data of volume to explain the economic uncertainty on volume volatility. The analysis period covers the period from January 2001 to August 2018, incorporating various market phases, such as the global financial crisis of 2008, the European debt crisis, and capital controls in the Greek economy. The methodology used for the research is the well-known GARCH model. Based on the estimated regressions, the present research findings showed that economic uncertainty has various effects on the volume volatility of the four systemic Greek banking institutions. More specifically, when economic uncertainty receives a high value, then the volatility of the volume in Greek banking institutions increases, receiving a higher value. In conclusion, it is observed that economic uncertainty positively affects the volume volatility of the Greek banking system.

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    • Figure 1. Greek banks’ volume (in y axes) evolution from 2001 to 2018
    • Table 1. Descriptive statistics
    • Table 2. Parameter estimates for the marginal distribution of returns
    • Conceptualization
      Leonidas Theodorakopoulos, Vicky Mamalougou, Konstantinos C. Giotopoulos
    • Data curation
      Leonidas Theodorakopoulos
    • Funding acquisition
      Leonidas Theodorakopoulos, Vicky Mamalougou
    • Methodology
      Leonidas Theodorakopoulos
    • Resources
      Leonidas Theodorakopoulos, Hera Antonopoulou, Vicky Mamalougou, Konstantinos C. Giotopoulos
    • Software
      Leonidas Theodorakopoulos, Vicky Mamalougou
    • Writing – review & editing
      Leonidas Theodorakopoulos, Hera Antonopoulou, Vicky Mamalougou, Konstantinos C. Giotopoulos
    • Project administration
      Hera Antonopoulou, Konstantinos C. Giotopoulos
    • Supervision
      Hera Antonopoulou
    • Formal Analysis
      Vicky Mamalougou
    • Investigation
      Vicky Mamalougou
    • Writing – original draft
      Vicky Mamalougou