The Reliable Aircraft Company manufactures small, pleasure-use aircraft. Based on past experience, sales volume appears to be affected by changes in the price of the planes and by the state of the economy as measured by consumers' disposable personal income. The following data pertaining to Reliable's aircraft sales, selling prices, and consumers' personal income were collected: Average Price Disposable Constant Income Year Aircraft Sales (Dollars) (In constant 2006 dollars, billions) 2006 525 16,800 610 2007 450 8,000 610 2008 400 8,000 590 The arc price elasticity of demand between 2006 and 2007 is: O -0.38 O 0.22 O 0.38 O o The arc income elasticity of demand between 2007 and 2008 is