What is the Spillover Effect?

The spillover effect refers to the effect of a purportedly unrelated event in one context on another event in the other context. Also, a spillover effect can be described as the impact of a primary action on a secondary action even though both actions occurred separately and at different places.

Spillover effects can be positive or negative but in most cases, spillover effects are negative.

Using countries or nations for example, a spillover effect is the impact of an unrelated event in the nation on the event in another nation.