Which of the following tests is not used to measure the competitive power of a company's resource strength?

The choice indicating that a resource strength should be internally developed is not typically utilized to measure the competitive power of that resource. When evaluating a company's resources, the focus is primarily on the characteristics that enable those resources to provide a competitive edge.

As such, the rarity and uniqueness of a resource (the first option) are crucial as resources that are rare are less likely to be available to competitors, contributing significantly to competitive advantage. The ability of rivals to counter a resource (the third option) is also important, as resources that can be easily replicated or neutralized do not provide a robust competitive advantage. Similarly, the importance of the resource for competitive advantage (the fourth option) assesses its direct impact on the company's market position.

The assertion that a resource strength must be internally developed does not directly relate to its competitive power. A company can acquire resources externally that may provide significant competitive advantages. Therefore, this choice does not align with the typical evaluative criteria used to assess resource strength in terms of competitive advantage.