I was nervous about qualifying on the basis of dual incomes for example: one party leaves, 2nd party has trouble finding a new roommate and now I've got a situation on my hands for an undetermined duration.  

First, you need something in writing from both parties, him saying he is vacating but understands he is still responsible for the duration of the lease and her that she wants to stay. 

Contracts are a two way street and they're just as responsible for the duration of the agreed upon term, as you are.

Our lease requires utilities on and in the tenant's name for the duration of the lease and any failure to do so is grounds for termination of the lease and eviction proceedings.

They're willing to discount the service provided their being kept whole on price up front, at the cost of service for duration.

My view is informed by my own uses, which have tended to be longer in duration.

Rent is one of the standard adjustments at Close and, as you indicated, it is prorated for the duration of the current rental period that the property will be owned by you.  

No, I’m talking about full-blown making it a focus of the United States (and the world’s) public schooling curriculum - given as much priority as language, math, and science throughout the entire 12 year duration of public education.My (perhaps naive) opinion is strongly in favor.

In my instance, the language put a limit on the duration of the exclusivity, and it was a short period.

No, I am not an agent.If your doing a contract for sale, rates are commonly in the 8 to 12% area but really are dependent upon amount of down payment, credit score, job duration, and location.