Define with a source or two the principal of Agency Law as it applys
to the following fictional transaction:  Mr. A is selling Mr. B a
widget.  Mr C, Mr B's agent, is sent to convey Mr. B's response. -- 
This is all the information available. -- Here is what I have said
about this issue thus far:  "Mr. C is described as an aide to Mr. B
and as such his authority to act or not to act on Mr. B's behalf is
covered under agency law.  If Mr. B employs Mr. C and if Mr. C is
acting in concert with his scope of employment then Mr. C's actions
would be as if Mr. B had personally delivered his response."  First,
if you could comment on how I have characterized the senerio, that
would be great.  And now for the hard part.  It is sometimes hard to
formulate a question when you are not sure what you are asking but
here goes:  Where is this thing "Agency Law"?  Is it part of the UCC? 
Is it part of Common Law (bear in mind I'm using vocabulary I am
barely familiar with)?  Could you point out a site where this "LAW"
is?  The last time I posted a question the answer was fabulous, but
the man did too much work.  I am just looking to make sure that I
don't sound like a complete fool talking about something I know little
about!  Thank you very much!!  PS, this all fictional.  I am in no way
soliciting for legal advice :-)

Agency is a concept found in the English Common Law from which
American Common Law descended. The details of this, as any law, may
vary depending on your jurisdiction ... but as a very general concept
"Agency" is similar throughout Anglo-American jurisprudence.

There is a fairly authoritative summary of Agency Common Law called
the Restatement of Agency ... a fat book but very organized. Amazon
ISBN 9991345639 --- you'll probably want to get it from your library
instead of buying it .. it seems to be out of print & hard to get a
hold of. It is put out by the American Law Institute please see
http://www.ali.org/ which does NOT CREATE the law, but (at least
purports to...) describe the law as it exists.

The Restatement of Agency was revised in 1957 and therefore called the
Restatement (Second) of Agency. A third Restatement appears to be
underway, please see
http://www.findarticles.com/p/articles/mi_qa3655/is_200210/ai_n9142773
smf  http://eprints.law.duke.edu/archive/00000854/  although I doubt
that the general concepts would change much.

---
The UCC is a model statute that may or may not be in force in any
jurisdiction you reside. That is, California may have adopted it with
one set of changes, whereas Nebraska may have adopted it with another
set of changes ... depending on the differences between the needs of
Nebraskans vs. Californias (... just an example... .) There may be
special statutes regarding agency in the UCC but the first thing to do
is to find out what was actually enacted in the relavant jurisdiction
(...which MAY be your home ... or MAY be somewhere else ... depending
on any relevant contract ... didja notice that your credit cards (if
any) are probably subject to the laws of South Dakota???)

If there is a law school anywhere near your town, I suggest asking the
law librarian. They often LOVE to answer these sorts of questions.
Your county court may also have a law library similarly helpful.

all this is strictly hypothetical of course!

---
P.S. according to the ALI:

"Restatement of the Law Second, Agency, deals with the relations
between principal and agent, principal and third person, and agent and
third person. In addition to stating the applicable rules when an
agency relationship exists, it deals with situations having legal
consequences similar to those characterized by an agency relationship.
Thus, it states not only the legal relations resulting when an agent
exceeds his authority, but also those resulting both before and after
ratification when one who is not an agent purports or assumes to act
as such. It also includes the termination of powers given as security,
powers which, although existing in the form of agency powers, do not
involve an agency relation because of the absence of a duty by the
powerholder to act for the benefit of the one granting the power.
Topics covered are titled Creation of a Relation; Creation and
Interpretation of Authority and Apparent Authority; Ratification;
Termination of Agency Powers; Duties and Liabilities of each party to
another; Admissibility in Evidence of Statement of Agents."

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P.P.S. Let me suggest you check out http://www.lectlaw.com/def/a026.htm