I am so confused because my textbook is contradictory, it says an increase in cost causes an upward shift in the S curve, but then it also says that a change in price will never shift the supply curve. I am lost! Thanks for any clarification you can provide!

2. The graph below illustrates the market for computers, which are normal goods. If the income of computer buyers falls at the same time a tariff is placed on imported parts used to make computers, how will equilibrium price and output in the market for computers be affected? Show the effect of these changes on the graph. (10 points) Price (thousands of dollars per PC) IO 25 40 Quantity (millions of PCs per year) [structions 1ere are two components to answering each question: (a) ovide an explanation; and (b) draw a graph. You should miliarize yourself with the assessment rubric (below) so that >u understand the required scope of your answers. DEIII'l'DE