21 (ii)  Internal decision-making, budget allocations and oversight processes enable effective responses to such impacts. (b) Appropriate action will vary according to: (i) Whether the business enterprise causes or contributes to an adverse impact, or whether it is involved solely because the impact is directly linked to its operations, products or services by a business relationship; (ii) The extent of its leverage in addressing the adverse impact. Commentary The horizontal integration across the business enterprise of specific findings from assessing human rights impacts can only be effective if its human rights policy commitment has been embedded into all relevant business functions. This is required to ensure that the assessment findings are properly understood, given due weight, and acted upon. In assessing human rights impacts, business enterprises will have looked for both actual and potential adverse impacts. Potential impacts should be prevented or mitigated through the horizontal integration of findings across the business enterprise, while actual impacts—those that have already occurred – should be a subject for remediation (Principle 22). Where a business enterprise causes or may cause an adverse human rights impact, it should take the necessary steps to cease or prevent the impact. Where a business enterprise contributes or may contribute to an adverse human rights impact, it should take the necessary steps to cease or prevent its contribution and use its leverage to mitigate any remaining impact to the greatest extent possible. Leverage is considered to exist where the enterprise has the ability to effect change in the wrongful practices of an entity that causes a harm.  Where a business enterprise has not contributed to an adverse human rights impact, but that impact is nevertheless directly linked to its operations, products or services by its business relationship with another entity, the situation is more complex. Among the factors that will enter into the determination of the appropriate action in such situations are the