A modification of the standard aggregate supply curve used in the aggregate market (or AD-AD) analysis to reflect the basic assumptions of Keynesian economics. The Keynesian aggregate supply curve contains either two or three segments. The strict Keynesian aggregate supply curve contains two segments, a vertical classical range and a horizontal Keynesian range, meeting a right angle and forming a reverse L-shape. An alternative version replaces the right angle intersection with a gradual transition between the two segments that is positively sloped and termed the intermediate range. The modern aggregate supply curve is largely based on this intermediate range.