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(Solved): If Jack bought 18 CDs last year when his income was \( \$ 20,000 \) and he buys 19 CDs this year wh ...
If Jack bought 18 CDs last year when his income was \( \$ 20,000 \) and he buys 19 CDs this year when his income is \( \$ 25,000 \), then for Jack CDs are a substitute good. a normal good. a complementary good. an inferior good.