Which of the following real-world phenomena does the classical model ignore?

The above table gives Sue's marginal utility schedules for sub sandwiches and Mountain Dew, the only products Sue consumes. Suppose initially the price of a sub sandwich is $4 each and the price of a Mountain Dew is $2 each. Sue's income is $12

If the price of subs rises to $6 each, Sue will consume A) more Mountain Dews. B) fewer subs. C) fewer Mountain Dews so that she can still afford to buy two subs. D) Both answers A and B are correct.

If the income elasticity of demand for a good is 0.5, then

a. it is a normal good, and its demand curve will shift to the left if buyers' incomes increase b. it is a normal good, and its demand curve will shift to the right if buyers' incomes increase c. it is an inferior good, and its demand curve will shift to the right if buyers' incomes increase d. it is an inferior good, and its demand curve will shift to the left if buyers' incomes increase e. there is insufficient information to determine whether the good is normal or inferior