Karla Hoffman - Academia.edu (original) (raw)

Papers by Karla Hoffman

Research paper thumbnail of A Practical Combinatorial Clock Exchange for Spectrum Licenses

Decision Analysis, 2010

ABSTRACT A centralized combinatorial exchange has been considered as a means to enable efficient ... more ABSTRACT A centralized combinatorial exchange has been considered as a means to enable efficient restructuring of spectrum holdings by allowing traders to buy and sell spectrum resources. We propose a new, two-sided, multiple-round, combinatorial clock exchange mechanism that enables traders to specify reserve prices and submit consolidated bundle orders on spectrum assets to be bought and sold. Any trader may submit multiple orders over several rounds. A trading agent's order can only be executed when it matches with bids and asks from one or more other agents. Acceptable bid and ask prices are adjusted each round to decrease the spread, and the final, market-clearing trades are executed to maximize the gains from trade. This paper outlines the clock mechanism and presents a new approach for allocation of surplus among the market-clearing agents to maximize incentives for participation.

Research paper thumbnail of A Bidder Aid Tool for Dynamic Package Creation in the FCC Spectrum Auctions1

We propose a bidder aid tool that will allow bidders to more effectively participate in combinato... more We propose a bidder aid tool that will allow bidders to more effectively participate in combinatorial FCC spectrum auctions by enabling concise expression of preferences. In addition to logical relationships between items, bidders may express spectrum-specific preferences such as those related to minimum population coverage, bandwidth, and budget. The tool can be used to simultaneously generate and valuate the optimal set biddable packages, both at the start of the auction and dynamically before each round. Preliminary testing suggests that the use of this tool may significantly simplify bidders' efforts in generating packages of interest, and thus lead to more efficient auction outcomes. '

Research paper thumbnail of A Package Bidding Tool for the Fcc’S Spectrum Auctions, and its Effect on Auction Outcomes

We present a bidder aid tool that allows bidders to more effectively participate in combinatorial... more We present a bidder aid tool that allows bidders to more effectively participate in combinatorial FCC spectrum auctions by enabling concise expression of preferences. In addition to logical relationships between items, bidders may express spectrum-specific preferences such as those related to minimum population coverage, bandwidth, and budget. The tool can be used to simultaneously generate and evaluate a set of most profitable biddable packages, both at the start of the auction and dynamically before each round. We also explore the effect of creating “best-fit” packages at each round. Our preliminary results show that the use of this tool may significantly simplify bidders’ efforts in generating packages of interest and lead to efficient auction outcomes.

Research paper thumbnail of Testing Linear Pricing Algorithms for use in Ascending Combinatorial Auctions1, 2

Informs Journal on Computing

Abstract In a one-sided ascending combinatorial auction, bidders place bids on packages of items.... more Abstract In a one-sided ascending combinatorial auction, bidders place bids on packages of items. When values are interdependent, multi-round auctions are employed to allow price discovery. In such designs, bidders desire feedback on the estimated prices of items and ...

Research paper thumbnail of Market-Based Alternatives for Managing Congestion at New York’s LaGuardia Airport

In the paper, we summarize the results of a project that was motivated by the expiration of the "... more In the paper, we summarize the results of a project that was motivated by the expiration of the "High Density Rule," which defined the slot controls employed at New York's LaGuardia Airport for more than 30 years. The scope of the project included the analysis of several administrative measures, congestion pricing options and slot auctions. The research output includes a congestion pricing procedure and also the specification of a slot auction mechanism. The research results are based in part on two strategic simulations. These were multi-day events that included the participation of airport operators, most notably the Port Authority of New York and New Jersey, FAA and DOT executives, airline representatives and other members of the air transportation community. The first simulation placed participants in a stressful, high congestion future scenario and then allowed participants to react and problem solve under various administrative measures and congestion pricing options. The second simulation was a mock slot auction in which participants bid on LGA arrival and departure slots for fictitious airlines.

Research paper thumbnail of Market-Based Alternatives for Managing Congestion

In the paper, we summarize the results of a project that was motivated by the expiration of the "... more In the paper, we summarize the results of a project that was motivated by the expiration of the "High Density Rule," which defined the slot controls employed at New York's LaGuardia Airport for more than 30 years. The scope of the project included the analysis of several administrative measures, congestion pricing options and slot auctions. The research output includes a congestion pricing procedure and also the specification of a slot auction mechanism. The research results are based in part on two strategic simulations. These were multi-day events that included the participation of airport operators, most notably the Port Authority of New York and New Jersey, FAA and DOT executives, airline representatives and other members of the air transportation community. The first simulation placed participants in a stressful, high congestion future scenario and then allowed participants to react and problem solve under various administrative measures and congestion pricing options. The second simulation was a mock slot auction in which participants bid on LGA arrival and departure slots for fictitious airlines.

Research paper thumbnail of Optimum Airport Capacity Utilization under Congestion Management: A Case Study of New York LaGuardia Airport

Transportation Planning and Technology, 2008

4804 words, including abstract) Abstract. In the United States, most airports do not place any li... more 4804 words, including abstract) Abstract. In the United States, most airports do not place any limitations on airline schedules. At a few major airports, the current scheduling restrictions (mostly administrative measures) have not been sufficiently strict to avoid consistent delays and have raised debates about both the efficiency and the fairness of the allocations. With a forecast 1.1 billion yearly air travelers within the U.S. by 2015, airport expansion and technology enhancement alone are not enough to cope with the competition-driven scheduling practices of the airline industry. The policy legacy needs to change to be consistent with airport capacities.

Research paper thumbnail of A Practical Combinatorial Clock Exchange for Spectrum Licenses

Decision Analysis, 2010

ABSTRACT A centralized combinatorial exchange has been considered as a means to enable efficient ... more ABSTRACT A centralized combinatorial exchange has been considered as a means to enable efficient restructuring of spectrum holdings by allowing traders to buy and sell spectrum resources. We propose a new, two-sided, multiple-round, combinatorial clock exchange mechanism that enables traders to specify reserve prices and submit consolidated bundle orders on spectrum assets to be bought and sold. Any trader may submit multiple orders over several rounds. A trading agent's order can only be executed when it matches with bids and asks from one or more other agents. Acceptable bid and ask prices are adjusted each round to decrease the spread, and the final, market-clearing trades are executed to maximize the gains from trade. This paper outlines the clock mechanism and presents a new approach for allocation of surplus among the market-clearing agents to maximize incentives for participation.

Research paper thumbnail of A Bidder Aid Tool for Dynamic Package Creation in the FCC Spectrum Auctions1

We propose a bidder aid tool that will allow bidders to more effectively participate in combinato... more We propose a bidder aid tool that will allow bidders to more effectively participate in combinatorial FCC spectrum auctions by enabling concise expression of preferences. In addition to logical relationships between items, bidders may express spectrum-specific preferences such as those related to minimum population coverage, bandwidth, and budget. The tool can be used to simultaneously generate and valuate the optimal set biddable packages, both at the start of the auction and dynamically before each round. Preliminary testing suggests that the use of this tool may significantly simplify bidders' efforts in generating packages of interest, and thus lead to more efficient auction outcomes. '

Research paper thumbnail of A Package Bidding Tool for the Fcc’S Spectrum Auctions, and its Effect on Auction Outcomes

We present a bidder aid tool that allows bidders to more effectively participate in combinatorial... more We present a bidder aid tool that allows bidders to more effectively participate in combinatorial FCC spectrum auctions by enabling concise expression of preferences. In addition to logical relationships between items, bidders may express spectrum-specific preferences such as those related to minimum population coverage, bandwidth, and budget. The tool can be used to simultaneously generate and evaluate a set of most profitable biddable packages, both at the start of the auction and dynamically before each round. We also explore the effect of creating “best-fit” packages at each round. Our preliminary results show that the use of this tool may significantly simplify bidders’ efforts in generating packages of interest and lead to efficient auction outcomes.

Research paper thumbnail of Testing Linear Pricing Algorithms for use in Ascending Combinatorial Auctions1, 2

Informs Journal on Computing

Abstract In a one-sided ascending combinatorial auction, bidders place bids on packages of items.... more Abstract In a one-sided ascending combinatorial auction, bidders place bids on packages of items. When values are interdependent, multi-round auctions are employed to allow price discovery. In such designs, bidders desire feedback on the estimated prices of items and ...

Research paper thumbnail of Market-Based Alternatives for Managing Congestion at New York’s LaGuardia Airport

In the paper, we summarize the results of a project that was motivated by the expiration of the "... more In the paper, we summarize the results of a project that was motivated by the expiration of the "High Density Rule," which defined the slot controls employed at New York's LaGuardia Airport for more than 30 years. The scope of the project included the analysis of several administrative measures, congestion pricing options and slot auctions. The research output includes a congestion pricing procedure and also the specification of a slot auction mechanism. The research results are based in part on two strategic simulations. These were multi-day events that included the participation of airport operators, most notably the Port Authority of New York and New Jersey, FAA and DOT executives, airline representatives and other members of the air transportation community. The first simulation placed participants in a stressful, high congestion future scenario and then allowed participants to react and problem solve under various administrative measures and congestion pricing options. The second simulation was a mock slot auction in which participants bid on LGA arrival and departure slots for fictitious airlines.

Research paper thumbnail of Market-Based Alternatives for Managing Congestion

In the paper, we summarize the results of a project that was motivated by the expiration of the "... more In the paper, we summarize the results of a project that was motivated by the expiration of the "High Density Rule," which defined the slot controls employed at New York's LaGuardia Airport for more than 30 years. The scope of the project included the analysis of several administrative measures, congestion pricing options and slot auctions. The research output includes a congestion pricing procedure and also the specification of a slot auction mechanism. The research results are based in part on two strategic simulations. These were multi-day events that included the participation of airport operators, most notably the Port Authority of New York and New Jersey, FAA and DOT executives, airline representatives and other members of the air transportation community. The first simulation placed participants in a stressful, high congestion future scenario and then allowed participants to react and problem solve under various administrative measures and congestion pricing options. The second simulation was a mock slot auction in which participants bid on LGA arrival and departure slots for fictitious airlines.

Research paper thumbnail of Optimum Airport Capacity Utilization under Congestion Management: A Case Study of New York LaGuardia Airport

Transportation Planning and Technology, 2008

4804 words, including abstract) Abstract. In the United States, most airports do not place any li... more 4804 words, including abstract) Abstract. In the United States, most airports do not place any limitations on airline schedules. At a few major airports, the current scheduling restrictions (mostly administrative measures) have not been sufficiently strict to avoid consistent delays and have raised debates about both the efficiency and the fairness of the allocations. With a forecast 1.1 billion yearly air travelers within the U.S. by 2015, airport expansion and technology enhancement alone are not enough to cope with the competition-driven scheduling practices of the airline industry. The policy legacy needs to change to be consistent with airport capacities.