Joakim Ahlberg


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Research results from Joakim


Intermodala transporter: definition, aktörer och omfattning

Intermodal and combined transport is often used synonymously today. The concept of combined transport has been around much longer and referred to as transportation where railway and a truck are being combined. Nowadays a combined transport often...

Ad hoc-processen: hur används ledig kapacitet i järnvägsnätet?

After the Swedish Transport Administration’s adoption of next year's timetable in mid-fall each year, starts the so-called ad hoc process, i.e. requests for train paths that can use spare capacity in the network. VTI received in September 2015...

Implementing Optimal Supply of Public Transport: The Choice between Tendering and...

This paper compares two approaches for providing public transport: competitive tendering and targeted subsidies. The subsidy option means that commercial operators charge a fare, and are paid by the public sector principal both per passenger and per...

Kostnader för störningar i infrastrukturen: metodik och fallstudier på väg och järnväg

The purpose of this study is to illustrate the methodology that can be used in calculations of the cost to society when disruptions in the infrastructure occurs, specifically for traffic on road and rail. The principles and values that are...

Elanvändning för längre och tyngre tåg: sammanfattning av resultat, erfarenheter och...

The ELVIS demonstration project aims to analyze how rail freight transports can be performed more efficiently. Hypotheses are that the transport efficiency can be improved by using longer and heavier freight trains and by implementing energy-related...

Etablering av konkurrerande snabbtågstrafik på Västra stambanan: översyn ur marknadens...

As of October 2010 the railway market is liberalised. As a result, other operators than SJ could apply for track capacity also for long-distance passenger services, and the timetable for 2012 was the first timetable that was affected by the...

Energimätning på tåg för rundvirkestransporter på sträckan Mora–Borlänge–Gävle

The third sub-project of ELVIS demonstration project for longer and heavier freight trains aims to analyze and measure energy usage of heavier trains. With heavier refers to a higher overall weight by more wagons, both loaded and unloaded, than...

Luftfartens samhällsekonomiska marginalkostnader: delstudie inom SAMKOST

This report is a literature review on the marginal social costs of aviation, and is a sub-project to VTI’s project about updating the knowledge of the external costs of traffic (SAMKOST). The report discusses which impacts of aviation are external,...

Optimal supply of public transport: subsidising production or consumption or both?

This paper compares two approaches for providing public transport: competitive tendering and vouchers. The functioning of tendering is well known. The voucher alternative means that commercial operators charge passengers a fare and are also paid by...

Marknadsöppning – och sen?: Samhällsekonomisk analys av förutsättningarna för en stärkt...

Swedens market for public transport, both bus and rail, was opened for entry in January 2012. Any fit, willing and able operator is entitled to provide services on a commercial basis. During the first year after market opening, little has happened....

Multi-unit common value auctions: a laboratory experiment with three sealed-bid mechanisms

This study addresses a discrete common value environment with independent (one-dimensional) private signals, where the seller offers two identical units and the buyers have (flat) demand for both. Each session is conducted with2, 3 or 4 buyers....

Multi-unit common value auctions: an experimental comparison between the static and the...

It is still an open question whether the dynamic or the static format should be used in multi-unit settings, in a uniform price auction. The present study conducts an economic experiment in a common value environment, where it is found that it is...

Analysis of discrete multi-unit, common value auctions: a study of three sealed-bid...

This paper proposes a discrete bidding model for both quantities and pricing. It has a two-unit demand environment where subjects bid for contracts with an unknown redemption value, common to all bidders. Prior to bidding, the bidders receive...

Multi-unit common value auctions: theory and experiments

Research on auctions that involve more than one identical item for sale was,almost non-existing in the 90’s, but has since then been getting increasing attention. External incentives for this research have come from the US spectrum, sales, the...

Revenues in discrete multi-unit, common value auctions: a study of three sealed-bid...

We propose in this paper a discrete bidding model, both on quantities and in pricing. It has a two-unit demand environment where subjects bid for contracts with an unknown redemption value, common to all bidders. Prior to bidding, the bidders...

Optimal taxation of intermediate goods in the presence of externalities: A survey towards...

The paper surveys the literature on optimal taxation with emphasis on intermediate goods, or, more specific, freight (road) transport. There are two models frequently used, first, the one emanated from Diamond & Mirrlees' (1971) paper, where the...