PROCUREMENT POLICY

We examine a variant of the uncapacitated lot-sizing model of WagnerWhitin involving sales instead of fixed demands, and lower bounds on stocks. Two extended formulations are presented, as well as a dynamic programming algorithm and a complete description of the convex hull of solutions. When the lower bounds on stocks are non-decreasing over time, it is possible to describe an extended formula...

In-use stock of a product is the amount of the product in active use. In-use product stocks provide various functions or services on which we rely in our daily work and lives, and the concept of in-use product stock for industrial ecologists is similar to the concept of net manufactured capital stock for economists. This study estimates historical physical in-use stocks of 91 products and 9 pro...

1 esearchers have looked into valuation effects for decades. Their research has usually focused on large capitalization stocks. Not as much research has been done on valuations in small capitalization stocks, as there is a tendency by many to associate small capitalization stocks with a growth style. Any research that has been done on small capitalization stocks was usually confined to the lowe...

Killing tens of thousand people and bringing tremendous loss, epidemics have been one the most huge urgent threats for all human kind. Given abruptness epidemic outbreaks, quick access to sufficient medical supplies is essential. Most existing research focuses on reserving physical stocks only, while some authors also consider production capacity. This study first capital reserves besides stock...

stock selection method in stock exchange is an important issue for investors in such markets. investors will gain benefits more than market average provided that they make logical decisions while selecting stocks. the issue of stock selection in markets like tehran stock exchange (that are not so efficient) is requires more attention of the investors as there is not a suitable equilibrium betwe...