Table 3.

Dimensional characteristics across intermediary types

DimensionSurrogate consumersOpinion leadersExpert sourcesSupplier-affiliated intermediaries
Part I: type dimensions (structural qualities)
1.Control structureHIGH – Stakeholder controlLOW – Distributed controlMODERATE-HIGH – Advisory controlMODERATE – Shared control
Unilateral decision authority through formal delegation; the client grants complete control over purchase decisionsNo decision authority; influence limited to information provision without binding powerStrong prescriptive influence approaching directive authority; recommendations carry professional weightInfluence through information control and option presentation; steering within the supplier portfolio
2.Covariation of interestCOORDINATION dominantCOORDINATION dominantMIXED coordinationCOMPETITION potential
Direct customer compensation aligns interests; fiduciary duty ensures outcome correspondenceNo commercial conflicts; genuine interest alignment through shared consumption valuesProfessional ethics promote coordination; potential conflicts from referral relationshipsDual allegiance creates interest divergence; supplier compensation may conflict with customer needs
3.Mutuality of dependenceASYMMETRIC → symmetricASYMMETRICASYMMETRICMODERATE symmetry
Initially customer-dependent; evolves toward mutual dependence through ongoing relationshipsThe customer depends on the leader for information; the leader is independent of individual followersThe customer depends on expert knowledge; the expert is less dependent on individual clientsMutual dependence on transaction completion; intermediary needs sales, customer needs access
4. Information availabilityHIGH transparencyVARIABLE transparencyMODERATE-HIGH transparencyMODERATE-LOW transparency
Full disclosure expected due to fiduciary duty; documented processes and clear communicationDepends on disclosure of commercial relationships; undisclosed sponsorships reduce transparencyProfessional standards require disclosure; technical complexity may limit complete comprehensionSupplier relationships are often undisclosed; information is filtered through commercial interests
5.Temporal structureCYCLICAL – ContinuousSEQUENTIAL – EpisodicSEQUENTIAL – Project-basedCONCURRENT – Transaction-linked
Ongoing relationships across multiple purchase cycles; sequential engagement through all stagesConcentrated in pre-purchase; one-directional communication; sporadic reengagementDefined engagement periods; concentrated pre-purchase and purchase involvementPeaks at purchase; maintains presence across stages tied to transaction lifecycle
Part II: degree dimensions (quantitative intensity measures)
6.Engagement intensityVERY HIGHLOW-MODERATEHIGHMODERATE
Deep cognitive, emotional and behavioral investment; comprehensive involvement in customer decisionsLimited to content creation and sharing; no direct investment in individual customer outcomesIntensive cognitive engagement during consultation; emotional investment in professional reputationVariable based on transaction value; higher for complex products, lower for routine purchases
7.Interaction frequencyCONTINUOUSSPORADICCONCENTRATEDVARIABLE
Regular touchpoints throughout the relationship; frequent communication across all journey stagesOne-to-many communication; infrequent individual interaction; content-driven engagementIntensive during project scope; minimal between engagements; appointment-basedHigh at the purchase point; sporadic pre-purchase; periodic post-purchase for service needs
8.Relationship durationLONG-TERMSHORT-TERM /episodicPROJECT-BASEDTRANSACTION-LINKED
Multi-year relationships; ongoing retainer arrangements; lifecycle partnershipsNo formal relationship; influence ends with content consumption; no commitmentDefined by engagement scope; may extend to ongoing advisory; relationship renewal optionalTied to purchase cycle; may extend through warranty/service period; renewal at repurchase
9.Interdependence strengthSTRONGWEAKMODERATE-STRONGMODERATE
High mutual influence; customer outcomes directly affect intermediary reputation and incomeLow mutual influence; leader success is not dependent on individual follower outcomesProfessional outcomes linked to recommendations; reputation effects create interdependenceTransaction completion creates mutual interest; limited post-purchase interdependence
10.Basis of influencePRESCRIPTIVEEXPERIENTIALINFORMATIONAL-PRESCRIPTIVETRANSACTIONAL
Authority-based influence through professional expertise and delegated decision powerInfluence through personal experience, authenticity, and social identificationInfluence through specialized knowledge, credentials and technical authorityInfluence through transaction facilitation, access provision and convenience

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