Originally Posted by
Myosmith
N+1 basically means that you will always desire one more bike than you already have. D-1 is staying one short of the number of bikes that would result in a divorce.
^^ this.
The corollary to this is that your D bike will cost you two times what you thought it would in order to make it the D-1 bike since you have to buy another one of equal value for your cyclist wife. Or if not a cyclist, then something of equal or greater value.
J.