We study a rail track access charging policy proposed by the Australian Rail Track Corporation (ARTC), in which a discount on access charges is offered if above-rail operators employ the “efficient train”. The efficient train is a train with a particular length, which results in the...

We consider a setting in which a not-for-profit rail infrastructure provider divides the costs of track maintenance and renewals and the costs of managing track access proportionally among above-rail operators based on their usage. We study a proposed access charge policy aimed at incentivizing...

Retailers, from fashion stores to grocery stores, have to decide what range of products to offer, i.e., their product assortment. New business trends, such as mass customization and shorter product life cycles, make predicting demand more difficult, which in turn complicates assortment planning....

Retailers, from fashion stores to grocery stores, have to decide what range of products to offer, i.e., their product assortment. Frequent introduction of new products, a recent business trend, makes predicting demand more difficult, which in turn complicates assortment planning. We propose and...