A．consumers are sometimes irrational
B．popularity usually comes after quality
C．marketing tricks are after effective
D．rarity generally increases pleasure

A．has left much room for readers’criticism
B．may prove to be a worthwhile purchase
C．has predicted a wider income gap in the us
D．may give its readers a sense of achievement

A．balance feeling good and spending money
B．spend large sums of money won in lotteries
C．obtain lasting satisfaction from money spent
D．become more reasonable in spending on luxuries