Three images of Keynesian multiplier process

Keynesian multiplier theory has now been presented invarious depictions of the multiplier process after many revisions.These inconsistent statements plus ambiguity of its definition and less rigorous derivation,have raised much query on the multiplier or absence in figuring it out.The existing accounts of Keynesian multiplier process were sorted into three images with explicit assumptions and causalities between variables in each image.It was found that current critical views of multiplier mainly arise from confusions on these images and inability of distinguishing them.Some misleading points were clarified to refute the criticisms.