p Own-Price Changes Ordinary demand curve Fixed p2 and y. p123 for commodity 1 X2 s yep p p1+p2 X2 p y p1+p2 y X p2 y X p1+p2p1 x1 * Ordinary demand curve for commodity 1 is Fixed p2 and y. x y p p 2 1 2 * = + x y p p 1 1 2 * = + x y p p 1 1 2 * = . + Own-Price Changes x1 x2 p1 ’ p1 ’’ p1 ’’’ y p2 y/p2