What are second and third order effects?

Answer 1

Effects have causes; effects can, and usually do, become causes of another effect(s); and there can be a large number of cause and effect "chains" created based on a single causal event. Thus Cause1 yields Effect1; Effect1 becomes Cause2, which yields Effect2 (second order effect); and Effect2 becomes Cause3, which yields Effect3 (third order effect).