Hi, I need an explanation about Marshallian money graph. Consider the case of two goods: Marshallian money y and good x. Let y be the numeraire good, so the price of y is py = 1. Let Px denote the price of good x. The initial endowment of money is M. And I need to know how to draw the graph when M = 20 and Px = [ (1, x<and equal to 10), (2, x>10)].