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Basis Risk and Net Interest Income of Banks


  • Mielus Piotr

    (Warsaw School of Economics, Collegium of Economic Analysis, Department of Quantitative Economics, Madalińskiego 6/8, 02-513 Warszawa, Poland)

  • Mironczuk Tomasz

    (Gdańsk Institute for Market Economics, Warsaw Branch, Kołobrzeska 16, 02-923 Warszawa, Poland)

  • Zamojska Anna

    (University of Gdańsk, Faculty of Management, Department of Econometrics, Armii Krajowej 101, 81-824 Sopot, Poland)


The results of the banking sector are shaped primarily by commissions and net interest income. Net interest income is determined by the difference between the profitability of bank assets and liabilities. In the case when a different method is used to determine interest for each side of the balance sheet, there occurs a basis risk that may lead to the deterioration in the net interest income of the sector. This is the situation in the Polish banking sector, which is characterized by the presence of variable interest rates for long-term assets and fixed interest rates for short-term liabilities. The study aims to verify the following thesis: in an environment of falling interest rates we can observe the deterioration in net interest income of the banking sector, as a result of the materialization of the basis risk. The authors of the article state that the source of the basis risk is the mismatch between the reference rate used to define the interest flow of loans and the actual cost of financing the balance through term deposits collected from non-financial entities.

Suggested Citation

  • Mielus Piotr & Mironczuk Tomasz & Zamojska Anna, 2016. "Basis Risk and Net Interest Income of Banks," Folia Oeconomica Stetinensia, Sciendo, vol. 16(2), pages 40-59, December.
  • Handle: RePEc:vrs:foeste:v:16:y:2016:i:2:p:40-59:n:4
    DOI: 10.1515/foli-2016-0024

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    References listed on IDEAS

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    More about this item


    net interest income of the bank; the cost of financing; interest rates on deposits; financial market indices;
    All these keywords.

    JEL classification:

    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G32 - Financial Economics - - Corporate Finance and Governance - - - Financing Policy; Financial Risk and Risk Management; Capital and Ownership Structure; Value of Firms; Goodwill


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