[单项选择]If you want to spend less, use cash, research confirms today.
Psychologist (67) out separate studies of how much people spend on their credit cards and in vouchers (代金券) (68) with cash. The results showed that participants spent cash much more (69) than other forms of payment. The author, Priya Raghubir of New York University, (70) payment methods from more transparent (cash) to less (credit cards and vouchers). The author wanted to test (71) "less transparent payment forms (72) to be treated like play money and are hence more easily spent".
One study was (73) as a market research exercise. Those questioned were given a (an) (74) and a menu for a fictional restaurant. Half of the respondents (调查对象) were told the restaurant would accept credit cards, while the other half were told it would accept cash only. Respondents were prepared to spend (75) more on their meal when they knew they could pay by