We investigate a dynamic Cournot duopoly with intraindustry trade, where firms invest in R&D to reduce the level of iceberg transportation costs. We adopt both open-loop and closed-loop equilibrium concepts, showing that a unique (saddle point) steady state exists in both cases. In the open-loop model, optimal investments and the resulting efficiency of transportation technology are independent...

This paper deals with an i * Corresponding author Email address:   nventory system with one central warehouse and a number of identical retailers. We consider perishable-on-the-shelf items; that is, all items have a fixed shelf life and start to age on their arrival at the retailers. Each retailer faces Poisson demand and employs (1, T) inventory policy. Although demand not met at a retai...

This paper analyzes and evaluates several policies aiming to mitigate the congestion effect a Transportation Network Company (TNC) brings bear on an idealized city that contains dense central core surrounded by larger periphery. The TNC offers both solo pooling e-hail services users of public transport. We develop spatial market equilibrium model over two building blocks: aggregate describes tr...

In this paper we develop methods for maximizing the throughput of a mobility-on-demand urban transportation system. We consider a finite group of shared vehicles, located at a set of stations. Users arrive at the stations, pick-up vehicles, and drive (or are driven) to their destination station where they drop-off the vehicle. When some origins and destinations are more popular than others, the...

this paper seeks to explore the status of municipalities in the implementation of local social policy based on the existing legal framework though analyzing all legislations and regulations pertaining to municipalities (specially tehran municipality). the paper uses both quantitative and qualitative content analysis and applies thematic analysis. research findings indicate that most of tasks an...

This study assesses the preparedness of long-term care facilities in Texas responding to Hurricanes Katrina and Rita. A 41-item questionnaire was mailed to facilities; the response rate was 42%. Among responding facilities, 4513 residents were evacuated, and 6% of respondents reported resident death. Financial losses were reported by 8% of nursing facilities and 45% of assisted living facilitie...