Peter Cramton

Q: What Schools Are Affiliated With Peter Cramton

Peter Cramton is affiliated with the following schools: University of Bonn, University of Pennsylvania, University of Maryland, College Park, University of Cologne, Stanford University, University of Iowa

Peter Cramton's AcademicInfluence.com Rankings

Peter Cramton

Economics

#2779

World Rank

#3161

Historical Rank

#944

USA Rank

economics Degrees

Download Badge

Economics

Peter Cramton's Degrees

PhD Economics University of Pennsylvania
Masters Economics University of Pennsylvania
Bachelors Economics University of Iowa

Similar Degrees You Can Earn

Why Is Peter Cramton Influential?

(Suggest an Edit or Addition)

According to Wikipedia, Peter Cramton is an American economist and academic. He is Professor of Economics at the University of Maryland, Emeritus since 2018, and holds the Market Design Chair in Economics at the University of Cologne.

(See a Problem?)

Peter Cramton's Published Works

Number of citations in a given year to any of this author's works

Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author

Published Works

Demand Reduction and Inefficiency in Multi-Unit Auctions (2014) (850)
The High-Frequency Trading Arms Race: Frequent Batch Auctions as a Market Design Response (2015) (649)
Dissolving a Partnership Efficiently (1985) (467)
Tradeable Carbon Permit Auctions: How and Why to Auction Not Grandfather (2002) (447)
The FCC Spectrum Auctions: An Early Assessment (1997) (340)
Bargaining in Incomplete Information (2002) (320)
Collusive Bidding: Lessons from the FCC Spectrum Auctions (2000) (315)
The Clock-Proxy Auction: A Practical Combinatorial Auction Design (2004) (315)
Combinatorial Auctions (2005) (296)
A capacity market that makes sense (2005) (293)
Capacity Market Fundamentals (2013) (292)
Economics and Design of Capacity Markets for the Power Sector (2012) (271)
Money Out of Thin Air: The Nationwide Narrowband PCS Auction (1995) (270)
Strategic Delay in Bargaining with Two-Sided Uncertainty (1992) (253)
The Convergence of Market Designs for Adequate Generating Capacity (2006) (249)
Electricity market design (2017) (225)
Spectrum Auction Design (2009) (223)
Synergies in Wireless Telephony: Evidence from the Broadband PCS Auctions (1997) (190)
Bargaining with Incomplete Information: An Infinite-Horizon Model with Two-Sided Uncertainty (1984) (189)
Strikes and Holdouts in Wage Bargaining: Theory and Data (1992) (173)
Auctioning Many Divisible Goods (2004) (163)
Deficit Reduction Through Diversity: How Affirmative Action at the FCC Increased Auction Competition (1996) (161)
Ascending Auctions (1998) (158)
Collusive Bidding in the FCC Spectrum Auctions (2001) (153)
Cartel Enforcement with Uncertainty About Costs (1990) (143)
Uniform Pricing or Pay-as-Bid Pricing: A Dilemma for California and Beyond (2001) (142)
Auctioning bus routes: the London experience (2006) (132)
Forward reliability markets: Less risk, less market power, more efficiency (2008) (122)
Simultaneous Ascending Auctions (2004) (120)
Promoting Efficient Use of Spectrum Through Elimination of Barriers to the Development of Secondary Markets (2001) (118)
Quadratic Core-Selecting Payment Rules for Combinatorial Auctions (2012) (111)
Electricity market design: the good, the bad, and the ugly (2003) (110)
Vickrey auctions with reserve pricing (2004) (108)
The Optimality of Being Efficient (1999) (100)
The Efficiency of the Fcc Spectrum Auctions* (1998) (97)
Why Every Economist Should Learn Some Auction Theory * (2000) (95)
Introduction to Combinatorial Auctions (2006) (90)
Ratifiable Mechanisms: Learning from Disagreement (1995) (79)
Competitive bidding behavior in uniform-price auction markets (2004) (78)
Pricing in the California Power Exchange Electricity Market: Should California Switch from Uniform Pricing to Pay-as-Bid Pricing? (2001) (73)
Virtual Power Plant Auctions (2010) (72)
Using forward markets to improve electricity market design (2010) (71)
Using Spectrum Auctions to Enhance Competition in Wireless Services (2011) (71)
Colombia Firm Energy Market (2007) (70)
Promoting Honesty in Negotiation: An Exercise in Practical Ethics (1993) (69)
An international carbon-price commitment promotes cooperation (2015) (68)
Dynamic Bargaining with Transaction Costs (1991) (66)
The Effect of Collective Bargaining Legislation on Strikes and Wages (1995) (66)
The Use of Replacement Workers in Union Contract Negotiations: The U.S. Experience, 1980–1989 (1995) (64)
Price carbon — I will if you will (2015) (61)
Efficient Relocation of Spectrum Incumbents* (1998) (60)
Shrewd Bargaining on the Moral Frontier: Toward a Theory of Morality In Practice (1991) (60)
Implementation Details for Frequent Batch Auctions: Slowing Down Markets to the Blink of an Eye † (2014) (58)
Unions, Bargaining and Strikes (2002) (58)
The Quadratic Core-Selecting Payment Rule for Combinatorial Auctions (2008) (57)
How Best to Auction Oil Rights (2005) (54)
Using Auction Theory to Inform Takeover Regulation (1991) (54)
The Determinants of U.S. Labor Disputes (1994) (52)
Why we need to stick with uniform-price auctions in electricity markets (2007) (50)
*Auctioning Greenhouse Gas Emissions Permits in Australia (2010) (42)
Market-Based Alternatives for Managing Congestion at New York’s LaGuardia Airport (2007) (41)
Wind Energy in Colombia: A Framework for Market Entry (2010) (41)
Sequential Bargaining Mechanisms (1985) (41)
Auctioning Securities (1998) (40)
Rational Frenzies and Crashes (2007) (39)
Designed to Fail: The Medicare Auction for Durable Medical Equipment (2015) (39)
Wage Bargining with Time-Varying Threats (1994) (39)
An overview of combinatorial auctions (2007) (38)
Set road charges in real time to ease traffic (2018) (37)
Shrewd Bargaining on the Moral Frontier: Toward a Theory of Morality in Pratice (1998) (36)
Global Carbon Pricing (2017) (35)
AEI-Brookings Joint Center Working Paper (2007) (34)
Nonrandom mixing models of HIV transmission (1989) (33)
Global Climate Games: How Pricing and a Green Fund Foster Cooperation (2012) (33)
Strikes and Holdouts in Wage Bargaining (2002) (30)
Two Papers on Sequential Bargaining. Paper 1: Sequential Bargaining Mechanisms. Paper 2: Bargaining with Incomplete Information an Infinite-Horizon Model with Continuous Uncertainty (1984) (30)
ESOP Fables: The Impact of Employee Stock Ownership Plans on Labor Disputes (2008) (29)
The Role of the ISO in U.S. Electricity Markets: A Review of Restructuring in California and PJM (1999) (28)
Global Carbon Pricing: The Path to Climate Cooperation (2017) (27)
A Review of ISO New England's Proposed Market Rules (1998) (27)
The German 4G Spectrum Auction: Design and Behaviour (2017) (26)
How Best to Auction Natural Resources (2009) (26)
Deception and Mutual Trust: A Reply to Strudler (1995) (26)
Handbook of Procurement: Dynamic auctions in procurement (2006) (25)
Lessons Learned from the UK 3G Spectrum Auction (2001) (25)
The Distributional Effects of Carbon Regulation: Why Auctioned Carbon Permits are Attractive and Feasible (1998) (24)
Auction Design for Wind Rights (2012) (24)
Relational Investing and Agency Theory (1994) (23)
Discrete clock auctions: an experimental study (2012) (23)
Activity Rules for the Combinatorial Clock Auction (2012) (22)
Simultaneous Ascending Auctions with Package Bidding (1998) (22)
Common-Value Auctions with Liquidity Needs: An Experimental Test of a Troubled Assets Reverse Auction (2008) (21)
The role of time and information in bargaining (1984) (20)
Borrow crisis tactics to get COVID-19 supplies to where they are needed (2020) (19)
Review of the Proposed Reserve Markets in New England (2005) (19)
Economists' Statement on Network Neutrality Policy (2007) (19)
Auction Design Critical for Rescue Plan (2008) (19)
International Climate Games: From Caps to Cooperation (2010) (18)
Pricing Rule in a Clock Auction (2010) (18)
A Troubled Asset Reverse Auction (2008) (17)
Simulation of the Colombian Firm Energy Market (2006) (17)
The 700 MHz Spectrum Auction: An Opportunity to Protect Competition In a Consolidating Industry (2007) (17)
Uniform-Price Auctions in Electricity Markets (2006) (17)
Market Design, Human Behavior, and Management (2020) (17)
Auctions and Takeovers (1998) (16)
New England’s Forward Capacity Auction (2006) (15)
Policy Brief—Translating the Collective Climate Goal Into a Common Climate Commitment (2017) (15)
Bringing the efficiency of electricity market mechanisms to multimodal mobility across congested transportation systems (2020) (15)
1 Dynamic Auctions in Procurement (2006) (15)
Auctioning the Digital Dividend (2009) (15)
Lessons from the United States Spectrum Auctions (2000) (14)
Comments on the RGGI Market Design (2007) (14)
Colombia’s Forward Energy Market (2007) (13)
A Review of the L-Band Auction (2008) (13)
Reducing Healthcare Costs Requires Good Market Design (2010) (13)
Price Is a Better Climate Commitment (2010) (13)
Comments of 71 Concerned Economists: Using Procurement Auctions to Allocate Broadband Stimulus Grants (2009) (12)
Package Bidding for Spectrum Licenses (1997) (12)
How to Negotiate Ambitious Global Emissions Abatement A Statement of Key Principles and an Explanatory Note (2013) (11)
Using auctions to divest generation assets (1997) (11)
Review of the Reserves and Operable Capability Markets: New England's Experience in the First Four Months (2000) (10)
Fear of losing in a clock auction (2012) (10)
Open access wireless markets (2017) (10)
Eliminating the Flaws in New England's Reserve Markets (2000) (10)
Auction-Based Timber Pricing and Complementary Market Reforms in British Columbia (2002) (9)
A Review of Markets for Clean Air: The U.S. Acid Rain Program (2000) (9)
Alternative pricing rules (2004) (9)
No Substitute for the "P" Word in Financial Rescue (2009) (9)
Money Out of Thin Air (1995) (8)
1 Markets for Road Use Eliminating Congestion through Scheduling , Routing , and Real-Time Road Pricing (2017) (8)
Using Technology to Eliminate Traffic Congestion (2018) (8)
Setting the Upset Price in British Columbia Timber Auctions (2002) (8)
Comparison of Auction Formats for Auctioning Wind Rights (2012) (8)
Prediction markets for electricity demand (2012) (7)
Innovation and Market Design (2009) (7)
A Review of the 10-40 GHz Auction (2008) (7)
How to Fix the Inefficiency of Global Cap and Trade (2012) (7)
Economists' Statement on U.S. Broadband Policy (2006) (7)
Incentive Auctions and Spectrum Policy (2012) (7)
Bargaining with a Shared Interest: The Impact of Employee Stock Ownership Plans on Labor Disputes (2010) (7)
Prediction Markets to Forecast Electricity Demand (2009) (7)
Upset Pricing in Auction Markets: An Overview (2003) (7)
Medicare Auction Failure: Early Evidence from the Round 1 Rebid (2012) (6)
Auction Design for Standard Offer Service (1997) (6)
Global Carbon Pricing: A Better Climate Commitment (2009) (6)
Multiple Factor Auction Design for Wind Rights (2012) (6)
The Efficiency of the FCC Spectrum Auctions (1998) (6)
Local Flexibility Market (2019) (5)
Foreword to Ross Baldick's 'Single Clearing Price in Electricity Markets' (2009) (5)
Design of the Reverse Auction in the Broadcast Incentive Auction (2015) (5)
How and why to auction not grandfather (1998) (5)
Auction Design for Medicare Durable Medical Equipment (2012) (5)
Appendix 3 Lessons Learned from the UK 3 G Spectrum Auction (2001) (4)
A Review of Markets for Clean Air: The U.S. Acid Rain Program by A. Denny Ellerman, Paul L. Joskow, Richard Schmalensee, Juan-Pablo Montero, and Elizabeth M. Bailey (2000) (4)
Fear of Losing in Dynamic Auctions: An Experimental Study (2009) (4)
Fix Medicare’s Bizarre Auction Program (2012) (4)
Some Political Economy of Global Warming (2012) (4)
Auction Design Enhancements for Non-Combinatorial Auctions (1997) (4)
Product Design for Colombia’s Regulated Market (2007) (4)
The Hidden Costs of a Flawed Medicare Auction (2012) (3)
Design of the Reverse Auction in the FCC Incentive Auction (2015) (3)
Fostering resiliency with good market design: lessons from Texas (2021) (3)
PILOT AUCTION FACILITY FOR METHANE AND CLIMATE CHANGE MITIGATION: RELEVANT AUCTION THEORY (2014) (3)
The effect of incumbent bidding in set-aside auctions: An analysis of prices in the closed and open segments of FCC Auction 35 (2008) (3)
Comments on Alternative Policy Options for Managing Capacity and Mitigating Congestion and Delay at LaGuardia Airport (2002) (3)
Impacts of Strike Replacement Bans in Canada (1999) (3)
Symposium on International Climate Negotiations (2015) (3)
A multi-decade micro-model of entry and exit in advanced wholesale markets (2020) (3)
Auctioning Long-term Gas Contracts in Colombia (2008) (3)
A Two-Sided Auction for Legacy Loans (2009) (3)
Market Design in Energy and Communications (2015) (3)
PILOT AUCTION FACILITY FOR METHANE AND CLIMATE CHANGE MITIGATION: RELEVANT ENVIRONMENTAL AUCTIONS (2014) (3)
Auctioning Rough Diamonds: A Competitive Sales Process for BHP Billiton’s Ekati Diamonds (2010) (3)
Letter from 167 Concerned Auction Experts on Medicare Competitive Bidding Program (2012) (3)
Resilient electricity requires consumer engagement (2021) (2)
Iterative Combinatorial Auctions (2009) (2)
Making Sense of the Aggregator Bank (2009) (2)
Computational Social Systems and the Internet (2007) (2)
Common‐Value Auctions with Liquidity Needs (2013) (2)
An Auction for Medicare Durable Medical Equipment: Evidence from an Industry Mock Auction (2012) (2)
A Practical Combinatorial Auction : The Clock-Proxy Auction (2004) (2)
Comment on Hoerger: Early Pilots of Medicare Auctions Bring No Solace to Auction Experts (2011) (2)
Flow Trading (2023) (2)
Improving the Cost-Effectiveness of the Conservation Reserve Program: A Laboratory Study (2019) (2)
A survey on the theory of collusion under adverse selection in auctions and oligopolies (2017) (2)
Why Large Licenses Are Best for the 700 MHz Spectrum Auction (2007) (2)
Testbed Experiments for Improving the Cost-Effectiveness of the Conservation Reserve Program (2018) (2)
Handbook of Telecommunications Economics , Martin Cave , (2001) (2)
Possible Design for a Greenhouse Gas Emissions Trading System (2007) (2)
Declaration of Peter Cramton (2001) (2)
Letter to Deputy Administrator Blum (CMS) on Medicare Auction (2010) (1)
Global Carbon Pricing: Essential, Inexpensive, and Feasible (2009) (1)
12 An International Carbon-Price Commitment Promotes Cooperation (2018) (1)
Capture Mechanisms in the Transport Sector (2017) (1)
How Can We Eliminate Traffic Congestion in Urban Centers (2017) (1)
An auction to procure capacity in a load pocket (2004) (1)
Report on Key Design Elements of Auctions Under Australia's Carbon Pollution Reduction Scheme (2008) (1)
Author ' s personal copy Using forward markets to improve electricity market design q (2010) (1)
Price Responsive Demand in Great Britain's Electricity Market (2021) (1)
A Market for Transport Eliminating Congestion through Scheduling , Routing , and Real-time Pricing (2016) (1)
Price Responsive Demand in Britain's Electricity Market (2021) (1)
Auctioning Rough Diamonds (2013) (1)
Report 1 B : Package Bidding for Spectrum Licenses (2017) (1)
Market Design: Auctions and Matching (2009) (1)
Rebuttal Addendum: Assessment of Submissions of the California Parties (2003) (1)
Competitive Auction Markets in British Columbia (2004) (1)
Bidding and Prices in the AWS-3 Auction (2015) (1)
Medicare Auction Conference (2012) (1)
Improving Public Safety Communications: An Analysis of Alternative Approaches (2007) (1)
The Revenue Impact of Competition Policy in the FCC Incentive Auction (2013) (1)
Market Design: Harnessing Market Methods to Improve Resource Allocation (2010) (1)
Letter from 244 Concerned Auction Experts on the Medicare Competitive Bidding Program (2012) (1)
Single Clearing Price in electricity Markets ii Foreword Perhaps the Most Celebrated result in economics (2009) (1)
Working Paper Department of Economics Dissolving a Partnership Efficiently (2011) (0)
Symposium on "International Climate Negotiations" - Introduction (2015) (0)
07271 Summary - Computational Social Systems and the Internet (2007) (0)
Power Price Blackout Supply Demand (2013) (0)
Testing for Anti-Competitive Bidding in Auction Markets (2002) (0)
PASADENA, CALIFORNIA 91125 RATIFIABLE MECHANISMS: LEARNING FROM DISAGREEMENT (2006) (0)
A REPLY TO STRUDLER1 (2016) (0)
Comments on Experimental Design for Evaluating Fcc Spectrum Auction Alternatives Major Comment: Test the Clock and Clock-proxy Auction Designs (2005) (0)
II . A Model of Wage Bargaining with a Two-Phase Threat (1994) (0)
Summary: Revenues in the 700 MHz Spectrum Auction (2007) (0)
Auctions for Injecting Bank Capital (2009) (0)
Introduction to this Chapter (2002) (0)
Design of a Suitable Auction Format for Competitive Sale of Alternative Energy Leases on the OCS ( AE Auction Design Study , Paper 2 of 3 ) Multiple Factor Auction Design for Wind Rights (2011) (0)
2 Commonalities in the design choices for VPP auctions (2009) (0)
Combinatorial Auctions. Edited by Peter (2007) (0)
Estimating Auction Revenues for the Proposed FCC Sale of 3G Spectrum for Broadband and Advanced Wireless Services (2003) (0)
3 Overview of the Combinatorial Clock Design 3 . 1 Environment : Heterogeneous Goods and Bidders (2008) (0)
2 Auctioning Securities (1998) (0)
Essential Entry: Revenues in the 700 MHz Spectrum Auction (2007) (0)
Revenues in the 700 MHz Spectrum Auction (2007) (0)
07271 Abstracts Collection - Computational Social Systems and the Internet (2007) (0)
Kyoto's Climate Game and How to Fix it (2010) (0)
2000 Biennial Regulatory Review Spectrum Aggregation Limits For Commercial Mobile Radio Services, WT Docket No. 01-14, Federal Communications Commission, "Declaration of Peter Cramton," (2001) (0)
The Impact of Incumbent Bidding in Set-Aside Auctions: An Analysis of Prices in the Closed and Open Segments of Fcc Auction 35 (2002) (0)
Auction Design for Colombia’s Forward Energy Market (2007) (0)
Reply Statement on Effect of NextWave ’ s Participation in the C-block Auction on Antigone and Devco Submitted by Submitted to (1997) (0)
Economic Comments on the Design of the 700 MHz Spectrum Auction (2007) (0)
Report 1 A : Auction Design Enhancements for Non-Combinatorial (2017) (0)
Anatomy of a Failed "Auction" for Medicare Supplies (2013) (0)
Expert Report of Peter Cramton (1998) (0)
An Overview of Combinatorial Auctions 1 (2007) (0)
Spectrum Auction Design (2013) (0)
How Affirmative Action at the FCC Auctions Decreased the Deficit (2001) (0)
An Analysis of Auction Volume and Market Competition for the Coastal Forest Regions in British Columbia (2002) (0)
Computational Social Systems and the Internet Dagstuhl Seminar (2007) (0)
Comments on DOC Notice of Preliminary Results of Countervailing Duty Review (2005) (0)
Reply Declaration of Peter Cramton (2001) (0)
Economics 703 Advanced Microeconomics Prof. Peter Cramton Lecture Note 4: Refinement A. Subgame Perfection Revisited (1998) (0)
C12) United States Patent Other Publications (2011) (0)
Expert Affidavit of Peter Cramton (2001) (0)
Response to the Congressional Hearing on Medicare's Durable Medical Equipment Competitive Bidding Program (2012) (0)
Economics 703 Advanced Microeconomics Prof. Peter Cramton Lecture Note 1: Foundations A. Introduction and Examples (1998) (0)
Ex Parte Declaration of Peter Cramton (2001) (0)
A Comparison of Equation-Based and Parity Pricing of Stumpage Fees for British Columbia Timber Under Long-Term Tenures (2002) (0)
The Case for Affirmative Auction: From Conscience to Coffers (1995) (0)
1-1-1994 Relational Investing and Agency Theory (2013) (0)
Reserve Prices, Stumpage Fees, and Efficiency (2002) (0)
Fear of losing in a clock auction (2012) (0)
Open Access Markets for Capacity and the Inseparability of Spectrum and Infrastructure (2020) (0)
- 1-Reserve Prices , Stumpage Fees , and Efficiency (2007) (0)
System and Method for the Efficient Clearing of Spectrum Encumbrances (2012) (0)
2 Motivating insights from auction theory and practice 2 . 1 (0)
Markets for Transport Eliminating Congestion through Scheduling , Routing , and Real-time Pricing (2016) (0)
Auctioning Timber to Maximize Revenues in British Columbia (2002) (0)
Economics 703 Advanced Microeconomics Prof. Peter Cramton Lecture Note 3: Mechanism Design Outline A. Introduction to Games with Incomplete Information C. Multilateral Trading Mechanisms 1. Dissolving a Partnership 2. Optimal Auctions A. Introduction to Games with Incomplete Information (1998) (0)
Working Paper Department of Economics Cheap Talk Car Matter If (2011) (0)
Economics 703 Advanced Microeconomics Prof. Peter Cramton Lecture Note 2: Dynamics (1998) (0)
Borrow crisis tactics to get COVID-19 supplies to where they are needed (2020) (0)
Market Design for Road Use (2017) (0)
Title of Document: OPEN BID AUCTIONS: A THEORETICAL AND AN EXPERIMENTAL STUDY (2008) (0)
Economics and Design of Capacity Markets for the Power Sector (2012) (0)
Ex Parte of Peter Cramton (2006) (0)
European Economic Association Auctioning Many Divisible Goods (2009) (0)
Discrete clock auctions: an experimental study (2011) (0)
Computational Social Systems and the Internet, 1.7. - 6.7.2007 (2007) (0)
Auction Model for the 3500 MHz Band (2020) (0)
Medicare Auction Reform (2012) (0)
WHEN A PARTNERSHIP IS TO BE DISSOLVED, who should buy out his associates (1987) (0)
Comments on the FCC’s Proposed Competitive Bidding Procedures for Auction 73 (2007) (0)
Auctions for Injecting Bank Capital (Addendum to 'A Troubled Asset Reverse Auction') (2008) (0)
Ex Parte Declaration of Peter Cramton Verizon Wireless Petition for Permanent Forbearance from Cmrs Number Portability ) ) ) ) ) (2003) (0)
www.econstor.eu Prediction Markets To Forecast Electricity Demand∗ (2009) (0)
Ex Parte Declaration of Peter Cramton Verizon Wireless Petition for Permanent Forbearance from Cmrs Number Portability ) ) ) ) ) (2003) (0)
Reply Statement on the Effect of NextWave’s Participation in the C-block Auction on Antigone and Devco (1997) (0)
Economist Letter to NTIA on 700 MHz Spectrum Auction (2007) (0)
Some Real World Examples of How the FCC Rules Help ( or Hurt ) Consumer Welfare and Auction Revenues Example 1 : Foreclosing entry (2007) (0)
Declaration of Peter Cramton on the AWS Auction (2006) (0)
Erratum: “Dynamic Bargaining with Transaction Costs” (1993) (0)
Affidavit of Peter Cramton (2000) (0)
Medicare Auctions: A Case Study of Market Design in Washington, DC (2011) (0)
Letter to Fcc Chairman Powell Concerning Auction 35 (2002) (0)
Market Effectiveness Assessment (2001) (0)
Set road charges in real time to ease traffic (2018) (0)
Two papers of sequential bargaining (1984) (0)
2 2 Combinatorial auctions in practice (2007) (0)

This paper list is powered by the following services:

Other Resources About Peter Cramton

What Schools Are Affiliated With Peter Cramton?

Peter Cramton is affiliated with the following schools:

Peter Cramton's Academic­Influence.com Rankings