单选题
The price of petrol increases and sales of tyres decrease. This reflects
A、
Petrol and tyres are substitutes, and there is a strong income effect.
B、
The demand for tyres is inelastic.
C、
Tyres are inferior goods.
D、
Petrol and tyres are complements, and there is also an income effect.
【正确答案】
D
【答案解析】
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