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We know from Measures of response:
elasticities that the quantity demanded of a normal good increases in response to an income increase, whereas the quantity demanded of an inferior good declines. Clearly, both jazz and
boarding are normal goods, as illustrated in Figure 6.10, because more of each one is demanded in response to the income increase from 
to 
. It would challenge the imagination to think that either of these goods might be inferior. But if J were to denote junky
(inferior) goods, and S super goods, we could envisage an equilibrium 
to the northwest of 
in response to an income increase, along the constraint 
; less J and more S would be consumed in response to the income increase.
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