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• Market efficiency in relation to the financial crisis of 2008

  31-50

  Balázs Bakosi

  Ákos Szűcs

  Views:

  353

  After the financial crisis of 2008 many scholars criticised the validity of the market efficiency hypothesis of the modern financial literature. The purpose of this paper is to investigate the adequacy of market efficiency based on Hungarian, and as a reference, on American securities. Besides classical statistical tools (autocorrelation function, Ljung-Box test, Augmented Dickey-Fuller test), we also used new approaches of the literature (Variance Ratio test). In addition to the simple hypothesis tests we tried to separate the different type of time series and explain the reasons for the different behaviours.

  Journal of Economic Literature (JEL) codes: G140

• The Rigidity of Labor Markets and the Unit Root in the Time Series of Unemployment rate: Raising a Problem

  103-114

  Janos Kormos

  Pal Czegledi

  Views:

  133

  The article is a review of the literature concerning the time series of the unemployment rate, and of the economic explanations behind the tests of these time series. We seek to identify the theoretical explanations behind a possible unit root in unemployment time series. We argue that the main difficulty faced by these unit root tests is the change in labor market institutions. The ffects of institutional changes make the traditional tests rather weak, while the panel unit root tests oversimplify the economics of the question. Our conclusion is that the possible application of the tests developed theoretically for nearly unit root processes seems to offer a way out of this dilemma.

  Journal of Economic Literature (JEL) classifications: C22, E24