A dealer forecasts that the discount rate on a 60-day bill will
be 5.10%. The current discount rate on a 90-day bill is 5.30%. What
is the highest 30-day repo rate the dealer can afford to pay and
still expect to break even? Explain your reasoning (and/or the
setup to solve this question).
The maximum rate is 5.65%.
Explanation:
The break-even 30-day repo rate is the rate at which an investor can make zero profit by carrying the following described trading:
Initially raise 30-day repo at x rate; invest in 90-day bill at 5.30%;
As the 30-day repo is matured, raise fund from 60-day bill at 5.10% to repay the 30-day repo;
Then as the 60-day bill matures, use the proceed from 90-day bill to repay the amount.
In other word, we have the below calculation to illustrate the trading:
Amount repay to fund raising (through 30-day repo and 60-day bill) = Amount receipt from 90-day bill investment
[1 + x*30/365] x [ 1 + 5.1% *60/365 ] = 1 + 5.30% * 90/365
<=> 1 + x*30/365 = 1.004646 <=> x = 5.65%.
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