2.3 According to the U.S. Consumer Expenditure Survey for 2008, Americans with incomes below

$20,000 spend about 39% of their income on housing.

What are the limits on their income elasticities of housing if all other goods are collectively normal?

Given that they spend about 0.2% on books and other reading material, what are the limits on their income elasticities for reading matter if all other goods are collectively normal? (Hint: See Solved Problem 4.2.) m