Equation (18) in p. 3

Instead of

 
DD=(1+B¯)λ-(1-rρ)·B¯·λ1-B¯B¯
(18)

Should be:

 
DD=(1+B¯)λ-(1-rρ)·B¯·λB¯-1B¯
(18)

Note the change of sign of the exponent in the last coefficient — it must be changed from

(1-B)/B

to

(B-1)/B

as shown in the second equation above.

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