http://learn.econschool.in/courses/course-v1:EconSchoolX+ES002+2016_T1/courseware/7be737931a644ee18526458ada1b2e71/e6d67c6795e64b7d88f44a9eba2908d4/@abhitesh, If you are asking about the solution. check this video by amit sir, the question in ISI has a change in endowments because of which px = 1
I overlooked certain things during the exam.