Oil prices doubled in 2008, from $67.49 per barrel in June 2007 to $133.88 per barrel in June 2008. Since prices of non-oil products rose less than 2 percent per year during 2003-08, we can assume prices of non-oil products have remained constant. Use a graph to show the income effect and substitution effect of the increase in oil prices in 2008. (You should use oil on the x-axis and non-oil products on the y-axis).