Will the supply at a point on a positively sloped, straight line supply curve be unitary elastic, elastic or inelastic ?
Es= 1, i.e., unitary elastic at any point on the supply curve if it touches the origin when extended.
Es > 1, i.e., elastic at any point on the supply curve if it touches the Y - axis when extended.
Es < 1, i.e., inelastic at any point on the supply curve if it touches the X- axis when extended.