The Collar command creates a new interest rate collar with the specified parameters. This is a combination of a long position in the corresponding interest rate cap and a short position in the corresponding interest rate floor.

Assume that we have a set of coupon payments to occur at the times $T_1$, $T_2$, ..., $T_n$. At each time instance $T_i$ the cap pays

$N$ is the nominal value,

${\mathrm{dT}}_i$ is the year fraction between dates $T_{i-1}$ and $T_i$,

$P\left(T_i\right)$ is a coupon payment at the time $T_i$,

$C_i$ is the fixed cap rate at time $T_i$,

$F_i$ is the fixed floor rate at time $T_i$.

The parameter floatingleg defines floating rate coupon payments. The parameters caprates and floorrates define the corresponding fixed rates. The first cap/floor rate corresponds to the first floating-rate coupon, the second cap/floor rate corresponds to the second floating-rate coupon, etc. If the size of the exerciserates list is smaller than the size of the floatingleg list then the last exercise rate will be used for all the remaining coupons.

The LatticePrice command can be used to price an interest rate cap using any given binomial or trinomial tree. The BlackPrice command will compute the price of an interest rate cap using the Black model.

$\mathrm{with}\left(\mathrm{Finance}\right)\:$

$\mathrm{SetEvaluationDate}\left(''November\; 17,\; 2006''\right)\:$

$\mathrm{EvaluationDate}\left(\right)$

$''November\; 17,\; 2006''$

$\mathrm{nominal}≔100$

$\mathrm{nominal}≔100$

$\mathrm{benchmark}≔\mathrm{BenchmarkRate}\left(6\,\mathrm{Months}\,\mathrm{EURIBOR}\,0.05\right)$

$\mathrm{benchmark}≔\mathbf{module}\left(\right)\mathbf{end\; module}$

$\mathrm{discount\_curve}≔\mathrm{ForwardCurve}\left(0.05\,'\mathrm{daycounter}'=\mathrm{Actual360}\right)$

$\mathrm{discount\_curve}≔\mathbf{module}\left(\right)\mathbf{end\; module}$

$\mathrm{start\_date}≔\mathrm{AdvanceDate}\left(2\,\mathrm{Days}\right)$

$\mathrm{start\_date}≔''November\; 19,\; 2006''$

$\mathrm{end\_date}≔\mathrm{AdvanceDate}\left(\mathrm{start\_date}\,20\,\mathrm{Years}\,'\mathrm{convention}'=\mathrm{ModifiedFollowing}\right)$

$\mathrm{end\_date}≔''November\; 19,\; 2026''$

$\mathrm{coupon\_dates}≔\left[\mathrm{seq}\left(\mathrm{AdvanceDate}\left(\mathrm{start\_date}\,6i\,\mathrm{Months}\right)\,i=0..40\right)\right]\:$

$\mathrm{floating\_leg}≔\left[\mathrm{seq}\left(\mathrm{ParCoupon}\left(\mathrm{nominal}\,\mathrm{discount\_curve}\,\mathrm{coupon\_dates}\left[i\right]\,\mathrm{coupon\_dates}\left[i+1\right]\right)\,i=1..40\right)\right]\:$

$\mathrm{ir\_cap}≔\mathrm{Cap}\left(\mathrm{floating\_leg}\,0.07\right)$

$\mathrm{ir\_cap}≔\mathbf{module}\left(\right)\mathbf{end\; module}$

$\mathrm{ir\_floor}≔\mathrm{Floor}\left(\mathrm{floating\_leg}\,0.03\right)$

$\mathrm{ir\_floor}≔\mathbf{module}\left(\right)\mathbf{end\; module}$

$\mathrm{ir\_collar}≔\mathrm{Collar}\left(\mathrm{floating\_leg}\,0.07\,0.03\right)$

$\mathrm{ir\_collar}≔\mathbf{module}\left(\right)\mathbf{end\; module}$

$\mathrm{cap\_price}≔\mathrm{BlackPrice}\left(\mathrm{ir\_cap}\,0.05\,0.2\right)$

$\mathrm{cap\_price}≔6.832847321$

$\mathrm{floor\_price}≔\mathrm{BlackPrice}\left(\mathrm{ir\_floor}\,0.05\,0.2\right)$

$\mathrm{floor\_price}≔2.642595692$

$\mathrm{collar\_price}≔\mathrm{BlackPrice}\left(\mathrm{ir\_collar}\,0.05\,0.2\right)$

$\mathrm{collar\_price}≔4.190251628$

$\mathrm{cap\_price}=\mathrm{floor\_price}+\mathrm{collar\_price}$

$6.832847321=6.832847320$

Brigo, D., Mercurio, F., Interest Rate Models: Theory and Practice. New York: Springer-Verlag, 2001.

Glasserman, P., Monte Carlo Methods in Financial Engineering. New York: Springer-Verlag, 2004.

Hull, J., Options, Futures, and Other Derivatives, 5th. edition. Upper Saddle River, New Jersey: Prentice Hall, 2003.

The Finance[Collar] command was introduced in Maple 15.

For more information on Maple 15 changes, see Updates in Maple 15.