pt tli ipatent licensing : a game theoretic analysisa game
TRANSCRIPT
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P t t Li iPatent Licensing :A Game Theoretic AnalysisA Game Theoretic Analysis
Shigeo MUTO(Tokyo Institute of Technology, Japan)
Symposium on Law and Economics of IP, J i K ik Hit t b hi U i it F b 18 2008
1
Josui-Kaikan, Hitotsubashi University, February 18, 2008
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Overview
A patent holder FirmsNew technology
Oligopoly (duopoly)Cournot (quantity-setting)
New technologycost-reducingnew product (q y g)
Bertrand (price-setting)new product
Inside or Outsidethe product market
Homogeneous goodsDifferentiated productsLicensing
F (l )
the product market
Strategic interactionin the product market
Fee (lump-sum)Royalty (per unit production)Auction pAuction
Open trading (take-it or leave-it)Negotiation
2Strategic interaction in licensing Game TheoryNegotiation
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Outline of the Talk
Duopoly market
Licensing Outside patent holder (e.g. Research lab.)Outside patent holder (e.g. Research lab.)Cournot
FeeFeeOpen trading (non-cooperative game)Negotiation (cooperative game)Negotiation (cooperative game)
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Overview
A patent holder FirmsNew technology
Oligopoly (duopoly)Cournot (quantity-setting)
New technologycost-reducinga new product (q y g)
Bertrand (price-setting)a new product
Inside or Outsidethe product market
Homogeneous goodsDifferentiated productsLicensing
F (l )
the product market
Strategic interactionin the product market
Fee (lump-sum)Royalty (per unit production)Auction pAuction
Open trading (take-it or leave-it)Negotiation
4Strategic interaction in licensing Game TheoryNegotiation
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Duopoly Market
N = {1, 2} : firms produce homogeneous goods{ , } p g gfirm 1’s cost function
cx (x : firm 1’s production level)cx1 (x1 : firm 1 s production level)firm 2’s cost function
cx2 (x2 : firm 2’s production level)
(inverse) demand functionprice of the productprice of the product
p = max ( a - (x1 + x2), 0 ) )
5( a : constant, a > c )
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Cost-reducing Technology
patent holder 0patent holder 0new technology c → c -ε
licenseelicensee → c -ε,
non-licensee → c
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Cournot Duopoly MarketBoth firms hold a license (cost: c-ε)
Each firm’s production (a-c +ε) /3; profit (a-c +ε)2/9p ( ) ; p ( )W(2)
One firm holds a license (cost: licensee c-ε,non-licensee c)ε≤ a-c :
Licensee’s production (a-c + 2ε) /3, profit (a-c + 2ε)2 /9N li ’ d ti ( )/3 fit ( )2/9Non-licensee’s production (a-c-ε)/3, profit (a-c-ε)2/9
ε> a-c : (drastic innovation, monopoly by licensee)Licensee’s production (a-c + ε) /2 profit (a-c + ε)2 /4Licensee s production (a c + ε) /2, profit (a c + ε) /4Non-licensee’s production 0, profit 0
licensee’s profit W(1) , non-licensee L(1)p ( ) , ( )Neither firm holds a license (cost: c)
Each firm’s production (a-c) /3; profit (a-c)2/9 L(0)
7Note: W(1) > W(2) > L(0) > L(1) ≥ 0
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Overview
A patent holder FirmsNew technology
Oligopoly (duopoly)Cournot (quantity-setting)
New technologycost-reducinga new product (q y g)
Bertrand (price-setting)a new product
Inside or Outsidethe product market
Homogeneous goodsDifferentiated productsLicensing
F (l )
the product market
Strategic interactionin the product market
Fee (lump-sum)Royalty (per unit production)Auction pAuctionOpen trading (take-it or leave-it)Negotiation
8Strategic interaction in licensing Game TheoryNegotiation
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Survey
Open trading (take-it or leave-it) : non-cooperative gamep g ( ) p g
Kamien-Tauman (84,86)( , )
Negotiation : cooperative game
Watanabe-Tauman (07)Watanabe-Muto (07)Watanabe-Muto (07)Kishimoto-Watanabe-Muto (08)
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Open Trading (Take-it or leave-it):N ti G A l i (K i & T t )Non-cooperative Game Analysis (Kamien & Tauman etc.)
Procedure :Procedure :1 Patent holder announces
fee p for licensing a patent
2 Each firm decides whether to buy the patent.If a firm buys the patent, y p
→ pay p and get the patent: cost c-εIf a firm does not buy the patent
→ pay nothing: cost cpay nothing: cost c
3 Each firm determines its production level.
∃ uniuque subgame perfect equilibrium
10Problems: Optimal licensing for the patent holder ?
→ diffusion of the patent, etc. ?
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2nd stage: whether to buy or not
Two firms buy: firm 1: W(2) - p firm 2: W(2) - pTwo firms buy: firm 1: W(2) p , firm 2: W(2) p
firm 1 buys if W(2) - p ≥ L(1)
→ p ≤ W(2) - L(1)
firm 2 : same
max. fee = W(2) - L(1)
Patent holder’s max profit : 2 (W(2) - L(1))
fee = W(2) - L(1)
firms (licensees): L(1) L(1)11
firms (licensees): L(1), L(1)
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2nd stage: whether to buy or not
One firm buys: licensee : W(1), non-licensee : L(1)licensee buys if W(1) - p ≥ L(0) non-licensee does not buy if L(1) ≥ W(2) - p
→ W(2) - L(1) ≤ p ≤ W(1) - L(0)(Note : W(2) - L(1) < W(1) - L(0))( ( ) ( ) ( ) ( ))
max fee = W(1) - L(0)
Patent holder’s max profit : W(1)-L(0)
fee = W(1) L(0)fee = W(1)-L(0)
firms : licensee L(0)
12non-licensee L(1)
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2nd stage: whether to buy or not
Neither firm buys: firm 1: L(0) , firm 2: L(0)
fi 1 d t b if L(0) ≥ W(1)firm 1 does not buy if L(0) ≥ W(1) - p
→ p ≥ W(1) - L(0)
firm 2 : same
Patent holder gains nothingPatent holder gains nothing.
( ) ( ) ( ) ( ) h ldW(1) - L(0) > W(2) - L(1) holds
Both firms buy One firm buys Neither firm buysy
p
13W(2)-L(1) W(1)-L(0)
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1st stage : optimal fee for patent holderTwo firms buy : Patent holder’s max : 2 (W(2) - L(1)),
firms (licensees) : L(1), L(1)( ) ( ), ( )
One firm buys : Patent holder’s max : W(1) - L(0),firms : licensee L(0) non licensee L(1)
Note : 2 (W(2) - L(1)) ≥ W(1) - L(0) ⇔ ε ≤ a-c
firms : licensee L(0), non-licensee L(1)
Equilibrium : ε ≤ a-c → fee = W(2)-L(1) two firms buy( ) ( ) y
pat. holder 2 (W(2) - L(1))firms (licensees) : L(1), L(1)( ) ( ), ( )
ε > a-c → fee = W(1) - L(0) one firm buyspat holder W(1)-L(0)
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pat. holder W(1)-L(0)firms : licensee L(0), non-licensee L(1)
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Open Trading (oligopoly n firms)
s* maximizes s (W(s) - L(s-1))
ε ≤ a-c → # of lecensees : s* ↓ as ε↑
f W( *) L( * 1)fee : W(s*) - L(s*-1)pat. holder’s profit :
s* (W(s*) - L(s*-1)) ↑ as ε↑s* (W(s*) - L(s*-1)) ↑ as ε↑licensee : L(s*-1), non-licensee : L(s*)
ε > a-c (drastic innovation) → # of lecensees : 1 (monopoly by licensee)# of lecensees : 1 (monopoly by licensee)
fee : W(1) - L(0) pat. holder’s profit: W(1) - L(0)
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p p ( ) ( )licensee : L(0), non-licensee : 0
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Fee vs. Royalty : CournotR lt All fi b th liRoyalty : All firms buy the license
royalty ε if non-drastic(a-c+ε)/2 if drastic(a c ε)/2 if drastic
Patent holder : Fee > RoyaltyConsumers: Fee > RoyaltyFirms: Royalty ≥ L(0) ≥ Fee
ε ≤ a-c Fee, Royalty# of firms n → ∞# of firms n
⇒ patent holder’s profit → ε(a-c)a-c : competitive output
under old technologyε > a-c (drastic innovation) Fee, Royalty
f fi16
# of firms n → ∞⇒ patent holder’s profit → (a-c+ε)2/4
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Fee vs. Royalty
Patent holder’s profit Cournot : Fee > RoyaltyBertrand : Fee = Royalty
Royalty often observed; why ?Differentiated goodsInside patent holder Royalty > Fee
Muto(1993), Wang(1998)
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Overview
A patent holder FirmsNew technology
Oligopoly (duopoly)Cournot (quantity-setting)
New technologycost-reducinga new product (q y g)
Bertrand (price-setting)a new product
Inside or Outsidethe product market
Homogeneous goodsDifferentiated productsLicensing
F (l )
the product market
Strategic interactionin the product market
Fee (lump-sum)Royalty (per unit production)Auction pAuctionOpen trading (take-it or leave-it)Negotiation
18Strategic interaction in licensing Game TheoryNegotiation
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Survey
Open trading (take-it or leave-it) : non-cooperative gamep g ( ) p g
Kamien-Tauman (84,86)( , )
Negotiation : cooperative game
Watanabe-Tauman (07)Watanabe-Muto (07)Watanabe-Muto (07)Kishimoto-Watanabe-Muto (08)
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Tauman-WatanabeNegotiation in licensing
→ Characteristic function form game (N, v)N : set of players, v(S) : worth of S ⊆ N
Procedure:1. Patent holder and all firms get together.2. Firms maximize their total profit. → monopoly3. Discuss how to share the profit based on v(S).
descriptive viewpoint, normative viewpointTauman and Watanabe assume:
negotiation in licensing & cooperation in productionego o ce s g & coope o p oduc oTU-game formulation
- assume fee & side-payments among firms20
assume fee & side payments among firms Solution: Shapley value - normative
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Tauman-Watanabev : {0,1,2} 1, 2 maximize their joint profit with cost c-ε
v({0,1,2}) = (a-c+ε)2/4{0,1} 1 with c-ε and 2 with c maximize their own profits
v({0,1}) = (a-c+2ε)2/9, v({2}) = (a-c-ε)2/9similarly v({0,2}) = (a-c+2ε)2/9, v({1}) = (a-c-ε)2/9
{1,2} 1, 2 maximize their joint profit with cost cv({1,2}) = (a-c)2/4
{0} v({0}) = 0
Shaplev value of (N, v) # of firms → ∞
⇒ Patent holder’s payoff → ε(a-c)
21Same payoff as in open trading
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Survey
Open trading (take-it or leave-it) : non-cooperative gamep g ( ) p g
Kamien-Tauman (84,86)( , )
Negotiation : cooperative game
Watanabe-Tauman (07)Watanabe-Muto (07)Watanabe-Muto (07)Kishimoto-Watanabe-Muto (08)
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Watanabe-Muto, Kishimoto-Watanabe-Muto
Negotiation only in licensing stage(cooperation in production stage often prohibited)(cooperation in production stage often prohibited)
→ Characteristic function form game with coalition structures
P dProcedure:1. Patent holder selects some firms and invite them to the negotiation on licensing issues. Any other firm cannot participate in the negotiation.2. If the patent holder and the firms reach an agreement on theamount of fee, then the patent holder licenses the firms to use thenew technology. 3. Every firm (licensee, non-licensee) determines its production
23Level.
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Watanabe-Muto, Kishimoto-Watanabe-Muto
Kishimoto, Watanabe and Muto assume:1 negotiation only in licensing1. negotiation only in licensing
firms act independently in production stage2 TU game formulation assume fee & side payments2. TU-game formulation - assume fee & side-payments
coalition structure : patent holder + firms invited to negotiationp gother firms (singletons)
3. Solution: core, bargaining set, Shapley value (Auman-Dreze value)
Watanabe-Muto : abstract model
24Kishimoto-Watanabe-Muto : Cournot oligopoly
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Watanabe-Muto, Kishimoto-Watanabe-Muto
{0,1,2} 1, 2 independently maximize their profits with cost c-εv({0 1 2}) = 2(a-c+ε)2/9v({0,1,2}) = 2(a c+ε) /90, 1 and 2 participate in negotiation.coalition structure {{0,1,2}}coalition structure {{0,1,2}}
{0,1} 1 with c-ε and 2 with c maximize their own profitsv({0,1}) = (a-c+2ε)2/9, v({2}) = (a-c-ε)2/9({ , }) ( ) , ({ }) ( )0 and 1 negotiate. 2 does not join.coalition structure : {{0,1},{2}}
{0,2} similar coalition structure {{0,2},{1}}
{1,2} 1, 2 independently maximize their profits with cost cv({1,2}) = 2(a-c)2/9Side payments between 1 and 2 are allowed
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Side-payments between 1 and 2 are allowed. {0} v({0}) = 0
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Watanabe-Muto, Kishimoto-Watanabe-Muto
Coalition structure ({0}∪S {{i}}i S)Coalition structure ({0}∪S, {{i}}i∈N-S)Core = ∅ for all coalition structuresBargaining sets ≠ ∅ for all coalition structuresBargaining sets ≠ ∅ for all coalition structures
s** maximizes s (W(s) - L(0))I th b i i tIn the bargaining sets,
patent holder’s maximum payoff = s**(W(s**)-L(0))
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Watanabe-Muto, Kishimoto-Watanabe-MutoComparison with open trading
Suppose patent holder invites s** firms to negotiation.Suppose patent holder invites s firms to negotiation.1. For large innovations,
# of licensees : same# of licensees : samepatent holder’s max profit : open trading > negotiationfirms’ profits : licensee open trading < negotiationfirms profits : licensee open trading < negotiation
non-licensee same(Drastic innovations: all are same)(Drastic innovations: all are same)
2. Small innovations
# of licensees : open trading > negotiationpatent holder’s profit : open trading > < negotiationfirms’ profits : licensee open trading < negotiation
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firms profits : licensee open trading negotiationnon-licensee open trading < negotiation
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Watanabe-Muto, Kishimoto-Watanabe-Muto
Comparison with open tradingComparison with open tradingSuppose patent holder invites s** firms to negotiation.
# of firms → ∞1 P t t h ld ’ fit i th b i i t ( )1. Patent holder’s profits in the bargaining set → ε(a-c)2. Patent holder’s profit in the Shapley value (Aumann-Dreze value)
( )/2→ ε(a-c)/2
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Remarks
Negotiation:Royalty → NTU-games (games without side-payments)Bertrand-type oligopolyi id t t h ldinside patent holdercomparison with open trading case
Production of new technologyResearch joint ventureResearch joint venture Katz, M.L. and Shapiro, C. (1986), How to license intangible
property, Quart. J. of Econ. Vol.101, 567-589, etc.property, Quart. J. of Econ. Vol.101, 567 589, etc.cooperative game theoretic approach
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ReferencesKamien, M.I. and Tauman, Y. (1984), The private value of a patent: A game
theoretic analysis, Journal ofEconomicsVol.4(Supplement), 93-118.K i M I d T Y (1986) F lti d th i t l fKamien, M.I. and Tauman, Y. (1986), Fees versus royalties and the private value of
a patent, Quart. J. Econ. Vol.101, 471-491.Tauman, Y. and Watanabe, N. (2007), The Shapley value of a patent licensing( ) p y p g
game: the asymptotic equivalence to non-cooperative results, Econ. TheoryVol.30, 135-149.
Watanabe N and Muto S (2007) Stable Profit Sharing in a Patent LicensingWatanabe, N. and Muto, S. (2007), Stable Profit Sharing in a Patent LicensingGame: General Bargaining Outcomes, Discussion Paper 07-10, Dept. of SocialEngineering, Tokyo Institute of Technology.
Kishimoto, S., Watanabe, N. and Muto, S. (2008), Bargaining Outcomes of PatentLicensing in Cournot Oligopoly Markets, mimeo.
Kamien, M.I. (1992), Patent licensing, in Handbook of Game Theory withEconomic Applications, Elsevier, 331-354.
30Sen, D. and Tauman, Y. (2007), General licensing schemes for a cost-reducing
innovation, Games and Economic Behavior Vol.59, 163-186.