In this paper we provide efficient algorithms for converting between timestamp values that signify some number of seconds from an arbitrary origin, and character strings specifying Gregorian dates, such as ‘January 1, 1993’. We give several algorithms that explore a range of time and space trade-offs. Unlike previous algorithms, those discussed here have a constant time cost over a greatly exte...

while conventional data envelopment analysis models set targets separately for each decision making unit, centralized recourse allocation model is presented where there is a centralized decision maker that supervises all the operating units. optimizing of total input consumption and total output production is the main aim of this model. in this paper, firstly the centralized output production m...

This paper develops an analytically tractable general equilibrium model of inventory dynamics. Inventories are introduced into a standard RBC model through a precautionary stockout-avoidance motive. Under persistent aggregate demand shocks, the model is broadly consistent with the U.S. business cycle and key features of inventory behavior, including (i) a large inventory stock-to-sales ratio an...

We study the importance of input-output (IO) linkages and sectoral productivity (TFP) in determining cross-country income differences. find that while highly connected sectors are more productive than typical sector poor countries, opposite is true rich ones. To assess quantitative role TFP differences differences, we decompose variation using a multisector general equilibrium model. IO substan...