An organisation becomes dependent when the resource it is seeking is both important and concentrated in the hands of few organisations. However, since organisations can be mutually dependent, an organisation will have power over another only if there is an asymmetry in the exchange relationship and that one organisation is more dependent than the other.
Resource exchange importance To determine whether a resource exchange is important for an organisation, two criteria are used. First, the "Magnitude of exchange" is "measurable by assessing the "proportion of total inputs or the proportion of total outputs accounted for by the exchange". For example, if a company sells only one product, it is dependent on the sale of this product. Then "Criticality" is "the ability of the organization to continue functioning in the absence of the resource or in the absence of the market for the output". For example, electricity is a small portion of a company expenditure but most office cannot function without it.
Discretion over resource Various means can be used to get control over a resource. These means includes possessing the resource (e.g. directly possessing knowledge), having ownership rights over the resource enforced by legal and social systems, being part of the
resource allocation process (e.g. a secretary can determine who access the boss) or being a user of the resource (e.g. workers can slow down production process to pressure employers). Finally, control can stem from the ability to "regulate the possession, allocation and use of resources and to enforce the regulation".
Concentration of resource control An organisation will be more dependent on another organisation if this organisation concentrate the control over an important resource. "Concentration of resource control" is then "the extent to which the focal organisation can substitute sources for the same resource". Concentration can for example stem from
market concentration, cartels, coordinated action, or regulation actors. ==Main hypothesis==