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This article deals with the interplay of explosive behaviour and long memory. We conduct Monte Carlo simulations and study the finite-sample properties of the popular unit root test by Phillips et al. (2011) against explosive alternatives. This test exhibits severe upward size distortions under the presence of strongly autocorrelated residuals. We propose the usage of a set of adjusted critical values which leads to a size-controlled test with increased power. As a complement, we consider the Lagrange Multiplier test against long memory by Tanaka (1999). We study European government bond yield spreads during the financial crisis.

AbstractThis article deals with the interplay of explosive behaviour and long memory. We conduct Monte Carlo simulations and study the finite‐sample properties of the popular unit root test by Phillips et al. (2011) against explosive alternatives. This test exhibits severe upward size distortions under the presence of strongly autocorrelated residuals. We propose the usage of a set of adjusted critical values which leads to a size‐controlled test with increased power. As a complement, we consider the Lagrange Multiplier test against long memory by Tanaka (1999). We study European government bond yield spreads during the financial crisis.

This article sheds light on the question whether arising sovereign credit risk in the EMU has been triggered by the US subprime crunch. By adapting recent econometric methodologies suggested in the related field of speculative bubbles, we find clear evidence for fast diverging (and even explosive) behavior of EMU government bond yields of peripheral countries relative to Germany during the financial and the European debt crisis. This might be caused by flight-to-quality effects to German government bonds coincident with the collapse of Lehman Brothers and by a loss of confidence in the fiscal stability of Greece, Ireland, Italy, Portugal and Spain during the European debt crisis. First, we find compelling evidence for bubbles in the Dow Jones Equity Real Estate Investment Trusts (REITs) index which serves as a weekly measure of economic activity in the North American real estate sector. Second, in our main analysis, we test whether the collapsing bubble in the housing market triggered the diverging government bond yields during two crisis regimes. Our findings indicate that this was the case in the course of the financial crisis, but not during the EMU sovereign debt crisis. These results suggest that the severe fiscal problems in peripheral countries are homemade rather than imported from the US. (C) 2017 Elsevier B.V. All rights reserved.

This article sheds light on the question whether arising sovereign credit risk in the EMU has been triggered by the US subprime crunch. By adapting recent econometric methodologies suggested in the related field of speculative bubbles, we find clear evidence for fast diverging (and even explosive) behavior of EMU government bond yields of peripheral countries relative to Germany during the financial and the European debt crisis. This might be caused by flight-to-quality effects to German government bonds coincident with the collapse of Lehman Brothers and by a loss of confidence in the fiscal stability of Greece, Ireland, Italy, Portugal and Spain during the European debt crisis. First, we find compelling evidence for bubbles in the Dow Jones Equity Real Estate Investment Trust (REITs) index which serves as a weekly measure of economic activity in the North American real estate sector. Second, in our main analysis, we test whether the collapsing bubble in the housing market triggered the diverging government bond yields during two crisis regimes. Our findings indicate that this was the case in the course of the financial, but not during the EMU sovereign debt crisis. These results suggest that the severe fiscal problems in peripheral countries are homemade rather than imported from the US.