We examine the impact of temporal and portfolio aggregation on the quality of Value-at-Risk (VaR) forecasts over a … based on asset class, or into a single portfolio. We compare the impact of aggregation to that of choosing a model for the … that the degree of temporal aggregation is most important. Daily returns form the best basis for VaR forecasts. Modelling …

-called productivity decompositions---add useful information to improve the performance of macro-level productivity forecasts. The paper … forecasts using micro-level information were always better than the macro alternative. …

We ran a field experiment in a Dutch retail chain consisting of 128 stores. In a random sample of these stores, we … introduced short-term sales competitions among subsets of stores. We find that sales competitions have a large effect on sales …, results are alike for sales competitions with and without monetary rewards, suggesting a high symbolic value of winning a …