21) Pete feeds his dog 100 percent more Pup-Peronis when Zuke’s treats increase in price by 50 percent. For Pete, Pup-Peronis and Zuke’s are ________ and the cross-price elasticity of demand is ________. A) complements; -1/2 B) substitutes; 2 C) substitutes; -2 D) complements; 2 E) substitutes; 1/2 22) The cross elasticity between computers and software is A) negative because they are substitutes. B) positive because they are substitutes. C) negative because they are complements. D) positive because they are complements. E) positive because they are normal goods. 23) If you know the cross elasticity between two goods is negative, then you know the goods are A) substitutes. B) normal goods. C) complements. D) inferior goods. E) inelastic goods. 24) If the price of a one good increases and the quantity demanded of a different good decreases, then these two goods are A) substitutes. B) normal goods. C) inferior goods. D) inelastic goods. E) complements. 25) If the cross elasticity of demand is negative, that means the goods A) have elastic demands. B) have inelastic demands. C) are complements. D) are substitutes. E) are inferior. 26) When two goods are related such that an increase in the price of one good decreases the quantity demanded of the other good, these goods are definitely A) normal goods. B) luxury goods. C) complements. D) substitutes. E) inferior goods. 27) If a lower price for good X increases the demand for good Y, the cross elasticity value for the two goods is A) negative. B) equal to zero. C) positive and less than one. D) positive and greater than one. E) possibly negative, positive, or zero, but there is not enough information to decide. 28) If two goods are ________, then an increase in the price of one leads to ________ in the quantity demanded of the other. A) complements; a decrease B) complements; no change C) substitutes; a decrease D) substitutes; no change E) normal; an increase 29) The cross elasticity of demand for blank DVDs and DVD burners is likely to be A) positive because they are substitutes. B) positive because they are complements. C) negative because they are substitutes. D) negative because they are complements. E) negative because with the advent of digital cameras, film and film cameras are inferior goods. 30) If the cross elasticity of demand between car insurance and new cars is -0.41, then car insurance and new cars are A) complements. B) substitutes. C) normal goods. D) inferior goods. E) unrelated goods.