This paper applies recently developed time series and heterogeneous panel nonlinear unit root tests to 24 OECD and 33 non-OECD countries’ consumption-income ratios over the period 1951–2003. This extends evidence provided in the recent literature to consider nonlinear adjustment in time...

This pa per suggests a simple method based on Chebyshev approximation at Chebyshev nodes to approximate partial differential equations. The methodology simply consists in determining the value function by using a set of nodes and basis functions. We provide two examples. Pricing an European...