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Measure of firm's market power
The Lerner index, formalized in 1934 by British economist of Russian origin Abba Lerner, is a measure of a firm's market power. The Lerner index is defined
Lerner_index
Economics term
techniques such as concentration ratios, the Herfindahl-Hirschman index and the Lerner index, regulators are able to oversee and attempt to restore market
Market_power
Measure of the relative size of firms
(that is, a higher share dispersion) will result in a higher index value. Lerner index Concentration ratio Marketing strategy Microeconomics N50 statistic
Herfindahl–Hirschman_index
Russian-British economist (1903–1982)
Abraham "Abba" Ptachya Lerner (also Abba Psachia Lerner; 28 October 1903 – 27 October 1982) was a Russian-born American-British economist. Born in Novoselytsia
Abba_P._Lerner
Economic term by Warren Buffett
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Economic_moat
Measure of the degree of monopoly power
segmentation index (MSI), which measures the degree of segmentation of the producing country in the two markets. The MSI was extrapolated from the Lerner Index of
Market_segmentation_index
American actor (1941–2023)
Michael Charles Lerner (June 22, 1941 – April 8, 2023) was an American actor. He was nominated for the Academy Award for Best Supporting Actor for his
Michael_Lerner_(actor)
Financial institution that accepts deposits
oligopoly. Competitiveness of the banking market can be estimated with the Lerner index and Boone indicator. Higher competition between banks tends to increase
Bank
Topics referred to by the same term
people with the name "Lerner Exchange," an illegal maneuver figuring in the conviction of ex-media baron Conrad Black Lerner index, a measure of a firm's
Lerner
Economic concept
perfect competition, then ratio of the overcharge to market price is the Lerner index of market power. When the overcharge is multiplied by the quantity purchased
Overcharge
Aspect of monopolistic markets
cost of production The Lerner index measures the level of market power and monopoly power that a firm owned.The higher Lerner index indicated the more monopoly
Monopoly_price
Anti-competitive business strategy
McCusker, J. J. (1997). How Much Is That in Real Money? A Historical Price Index for Use as a Deflator of Money Values in the Economy of the United States:
Embrace, extend, and extinguish
Embrace,_extend,_and_extinguish
Market dominated by a small number of sellers
the Lerner index, stochastic frontier analysis, New Empirical Industrial Organization (NEIO) modeling, as well as the Herfindahl-Hirschman index. As a
Oligopoly
Additional total revenue generated by increasing product sales by 1 unit
equilibrium. (P − MC)/ P = −1/e is called the Lerner index after economist Abba Lerner. The Lerner index is a measure of market power — the ability of
Marginal_revenue
Ratio between turnover and profit
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Profit_margin
American economist
Josh Lerner is an American economist known for his research in venture capital, private equity, and innovation and entrepreneurship. He is the Jacob H
Josh_Lerner
Market structure with a single firm dominating the market
higher price in a less elastic market. Market power can be estimated with Lerner index. High profit margins might be caused by different factors, such as risk
Monopoly
Mutually beneficial collusion among competing corporations
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Cartel
Growing one's existing wealth without creating new wealth
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Rent-seeking
Surname list
Lerner (/ˈlɜːrnə/ LUR-nə) is a German surname, a variant of Larner. Originating from southern Germany, it may be either a habitational name for someone
Lerner_(surname)
Unit selling price minus its variable cost
a company has monopoly power in competition law, such as use of the Lerner index test. The Unit Contribution Margin (C) is Unit Revenue (Price, P) minus
Contribution_margin
Monopoly with legal enforcement
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Legal_monopoly
General term for rules, including delegated legislation and self-regulation
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Regulation
Problem of setting prices by a public monopoly
first-best solution (price equal to marginal cost). Amoroso–Robinson relation Lerner index Ramsey, Frank P. (1927). "A Contribution to the Theory of Taxation".
Ramsey_problem
When a company owns its supply chain
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Vertical_integration
Loans with unfairly high interest rate
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Usury
Form of non-compete clause used in the live music industry
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Radius_clause
Concept in economics
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Artificial_scarcity
Type of secondary boycott (anti-competitive)
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Group_boycott
Form of political corruption
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Regulatory_capture
Commerce phenomenon
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Cornering_the_market
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Limit_price
American academic and political movement
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
New_Brandeis_movement
Concept in economics
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Natural_monopoly
Type of oligopoly
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Duopoly
Price increases perceived as excessive
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Price_gouging
1890 U.S. anti-monopoly law
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Sherman_Antitrust_Act
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Australian_Consumer_Law
Deliberately undercutting prices to eliminate competition
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Predatory_pricing
Business process
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Horizontal_integration
Form of government regulation on professions or vocations for compensation
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Occupational_licensing
Term in contract law where a person agrees not to compete
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Non-compete_clause
Market structure with one buyer
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Monopsony
Anticompetitive agreement to control prices
Collusion George Howard Earle Jr. FBI Fixed price Gold fixing Herfindahl index London Gold Pool Monopoly Oligopoly Price controls Price fixing cases Price
Price_fixing
Economic theory
Exclusive dealing Information asymmetry Overchoice Starting a Business Index Strategic entry deterrence Vendor lock-in Zero-profit condition McAfee,
Barriers_to_entry
Switching costs inhibiting a change of vendor
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Vendor_lock-in
Potentially unlawful anti-competitive practice
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Refusal_to_deal
1976 American law
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Hart–Scott–Rodino Antitrust Improvements Act
Hart–Scott–Rodino_Antitrust_Improvements_Act
Term in market economics
are stochastic dominance and Gini coefficient. The Herfindahl–Hirschman index (HHI) (the most commonly used market concentration) is added portion of
Market_concentration
Processes through which companies combine or transfer ownership
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Mergers_and_acquisitions
relationship between market concentration and innovation. The Herfindahl–Hirschman index (HHI) is the most commonly used measure of market concentration in competition
Competition_law_theory
Acting as a lawyer
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Practice_of_law
1936 US law prohibiting price discrimination
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Robinson–Patman_Act
US federal law
commonly does today. The government often employs the Herfindahl-Hirschman Index (HHI) test for market concentration to determine whether the merger is presumptively
Clayton_Antitrust_Act_of_1914
Setting prices artificially low to discourage competition
the use of anti-dumping measures by the European Union. "Dumping (International trade)" from the Global Legal Information Network Subject Term Index
Dumping_(pricing_policy)
Concept in antitrust law
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Monopolization
American historian and woman's history author (1920–2013)
Gerda Hedwig Lerner (née Kronstein; April 30, 1920 – January 2, 2013) was an Austrian-born American historian and woman's history author. In addition to
Gerda_Lerner
Concept in competition law
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Small but significant and non-transitory increase in price
Small_but_significant_and_non-transitory_increase_in_price
American anti-monopoly government bureau
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
United States Department of Justice Antitrust Division
United_States_Department_of_Justice_Antitrust_Division
deterministic, the other probabilistic, of Amoroso–Robinson's formula. Lerner index Ramsey problem Robinson 1932, p. 544–554. Jensen 1967, p. 712-722. Robinson
Amoroso–Robinson_relation
Agreements between firms at different levels of a supply chain
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Vertical_agreement
Economics of regulation
quality, such as the Worldwide Governance Indicators (WGI) Regulatory Quality Index, are widely used in regulatory economics to assess the effectiveness, consistency
Regulatory_economics
Cooperation between firms to limit competition
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Collusion
Market structure with few buyers
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Oligopsony
Practices that prevent or reduce competition in a market by a business or government
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Anti-competitive_practices
State-sanctioned monopoly by a private company
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Government-granted_monopoly
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
List_of_price_fixing_cases
American legal doctrine
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Rule_of_reason
Anti-competitive practice
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Resale_price_maintenance
Type of monopoly
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Coercive_monopoly
Form of procurement fraud
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Bid_rigging
Principle in US antitrust law
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Noerr–Pennington_doctrine
Act of the Parliament of Australia
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Competition and Consumer Act 2010
Competition_and_Consumer_Act_2010
Type of claim of monopolization made under competition laws
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Essential_facilities_doctrine
Measure of the strength of a brand, product, service or firm
Alba's dominance index ( ID {\displaystyle {\text{ID}}} ), described as the Herfindahl–Hirschman index of a Herfindahl–Hirschman index ( HHI {\displaystyle
Market_domination
Law maintaining market competition
economic power. As such, courts often examine include the Herfindahl-Hirschman Index, the propensity of oligopoly via economic links, the transparency of a market
Competition_law
Legal history
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
History_of_competition_law
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Dividing_territories
Legal concept
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Relevant_market
Tax on monopoly profits
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Excess_profits_tax
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Second_request
Anti-competitive business practice where a supplier limits the rights of the buyer
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Exclusive_dealing
Economics term
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Monopoly_profit
Neoclassical economic model
The Lange model (or Lange–Lerner theorem) is a neoclassical economic model for a hypothetical socialist economy based on public ownership of the means
Lange_model
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Copyright_misuse
Collusion between competitors
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Tacit_collusion
Restriction of an occupation to only qualified practitioners
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Occupational_closure
United States government agency
peer review, that their journals are included in any academic journal indexing service or any measurement of the extent to which their journals are cited
Federal_Trade_Commission
Economic scenario
using indices such as the (Modified) Rail Transportation Infrastructure Index (M-RTI or simply 'RTI') combining cost-efficiency and average speed metrics
Competition_(economics)
Offering several products as one
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Product_bundling
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Independent Communications Authority of South Africa
Independent_Communications_Authority_of_South_Africa
Commerce practice
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Tying_(commerce)
Legal doctrine in antitrust law
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Consumer_welfare_standard
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Raising_rivals'_costs
Improper use of patent rights
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Patent_misuse
Principle in antitrust law in the United States
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Parker_immunity_doctrine
Australian review body
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Australian Competition Tribunal
Australian_Competition_Tribunal
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Merger_control
Vendor lock-in Vertical integration Measures Herfindahl–Hirschman index Lerner index Market share Profit margin SSNIP test Mitigation Excess profits tax
Third_line_forcing
American developmental psychologist
Developmental Science. SAGE Publications. p. 647. ISBN 9781452265223. Faculty profile Jacqueline Lerner publications indexed by Google Scholar v t e
Jacqueline_Lerner
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