This Stock issue basically guarantees the Negative the plan is not in the status quo. For example, if someone ran a plan for the US to sign the ABM treaty, you could argue Inherency because this plan is already happening. Inherency is good to run if the plan really is occurring, but other wise try to avoid it. There are several different types of Inherency. The first, and best, to have as an Affirmative is called structural inherency.
Structural inherency is a law or treaty that prevents the plan from happening.
If this is the inherency you employ, then you must revoke that law or treaty in your plan. The second is attitudinal inherency. This merely means that Congress or some other area of government that Congress control, just doesn't want to do the plan. There attitude is a barrier. Your agent of action might be the one with the attitude.