This paper assesses the stochastic convergence of relative CO₂ emissions within three different sets of countries over the period 1950-2013. Using the Local Whittle (LW) estimator and its variants we investigate whether relative per-capita CO₂ emissions are long memory processes which, although...

This paper aims to shed new light on ”law of one-price” in the United States’ gasoline market over the period June-2003-December-2019. Specifically, we test for convergence of the retail prices of gasoline in di↵erent US PADDs, states and cities using the Local Whittle estimator (LW) and...

We propose semi-parametric CUSUM tests to detect a change point in the covariance structure of non-linear multivariate models with dynamically evolving volatilities and correlations. The asymptotic distributions of the proposed statistics are derived under mild conditions. We discuss the...