This paper utilizes three univariate ARCH-type models to empirically examine persistence and asymmetry in volatility of prices of primary agricultural commodities produced in Sub-Sahara Africa. Maximum likelihood estimation results of the three models ranked the GARCH version as the best...

In this note we derive a general formula useful to express the density of generalised noncentral quadratic forms (i.e. of a scalar random variable obtained by contracting non zero mean multivariate normal vectors over multidimensional arrays) in terms of linear combinations of noncentral chi...

This paper analyses the exercise decision of non-exclusive real options in a two-player setting. A general model of non-exclusive real options, allowing the underlying asset to follow any strong Markov process is developed, thus extending the existing literature, which is mainly based on...

This paper proposes and analyses a measure of distance for the unit root hypothesis tested against stochastic stationarity. It applies over a family of distributions, for any sample size, for any specification of deterministic components and under additional autocorrelation, here parameterised...

This paper is about how the constraints imposed by natural resource scarcity affects economic growth and its sustainability. We extend the creative destruction model of Aghion and Howitt(1998, ch.5) to study its transitional dynamics. This extension allows us to describe the dynamics of the...

We use data on individual patients in general practices to examine whether income related inequality in self reported health differs across general practices and whether such differences are explained by characteristics of the practices. We allow for the simultaneous determination of health and...

In this paper we explore the possibility of "partial-multihoming" in a two-sided market where a subset of agents, on one or both side(s), may multihome in equilibrium. We consider a model in which platforms are spatially differentiated and on each side of the market there are two type of agents,...