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https://www.1point3acres.com/bbs/thread-770973-1-1.html
case是credit card,先问credit card如何盈利,如何界定是否应该approve
例子是某人刷卡300刀,给current balance,credit limitation,interest rate(interested paid monthly in future 3 months),cost of fund rate,transaction fee%,default rate,问是否要approve这笔transaction,算break even和画图等
还是revenue-cost=profit一套分析,就是一定要问清楚每个rate是revenue side还是cost side,yearly还是monthly,要乘在哪笔钱上,乘完之后与balance和limit的关系
CASE 2: 依然是地里出现过的信用卡题,有一笔$300的交易将会使credit balance above the credit limit
Q1:这里先没有引出over credit limit的条件,只是问你如果你被要求approve or decline a transaction, what factors to consider
Is it an unnormal transaction (big transaction at an unusual location? Shop? Suspicious website?)
Is it over credit limit
Q2: 有一笔300刀的消费,over the credit limit, again, what factor to consider?
Q3: 给了数据, credit line $5000, current balance$4800, APR15%, cost of fund 3%, interchange fee 1.5%, assume 98% pay off the transaction, 2% default, will you approve such transaction?
Revenue = (300*(15%-3%)/12+200*1%+100*1%)98% +1.5%*300 = 10.38
Cost = 300* 2%
Profit = 10.38- 6 =4.38
算出来expected gain = 4.38,so approve it
Q4: 因为上一题算出来positive expected gain, 银行决定approve 类似的transactions,但是一段时间后发现收益是负的,什么原因?
Real default rate is higher than expectation
Q5: 现在发现实际default rate是7%而不是2%,我们应该approve吗?
Cost = 300*7% =21
Revenue= (300*(15%-3%)/12+200*1%+100*1%)93% +1.5%*300=5.58+ 4.5=10.08
Profit = 10.08-21 = -10.92
算出来为-10.92,所以不要approve
Q6: what default rate to make it breakeven?
300X=6(1-X)+4.5
306X=10.5
X= 3.43
算出来3.4%
Q7: draw a graph to reflect relationship between default rate (X axis) and profit (Y axis) |
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