This paper provides comparisons of a variety of time-series methods for short-run forecasts of the main greenhouse gas, carbon dioxide, for the United States, using a recently released state-level data set from 1960-2001. We test the out-of-sample performance of univariate and multivariate...

Why do some countries have no first-order administrative subdivisions (e.g., states or provinces), whereas other countries have over 80? Recently, economists have started to look at the optimal size of countries and forces influencing the creation of local political jurisdictions like school...