from the given information
TR1 = P1 * Qd1 = 15 * 1000 = 15000
TR2 = P2 * Qd2 = 10 * 1800 = 18000
We are better of with P2 as it provides with more Qd with less P and the reveune is also more.
lost revenue = TR2 - TR1 = 15000 - 18000 = -3000
common revenue = 15000
gained revenue = 18000 - 15000 = 3000
2) Assume that we have a diagram with the following info.: P=$15, Qd1=1,000; Py=$10 and Qd2=1,800...