Subject:
Financial Economics A kind of economic theory.
Financial economics is the branch of economics concerned with “the allocation and deployment of economic resources, both spatially and across time, in an uncertain environment”. It is additionally characterised by its “concentration on monetary activities”, in which “money of one type or another is likely to appear on both sides of a trade”. The questions within financial economics are typically framed in terms of “time, uncertainty, options and information”.
* Time: money now is traded for money in the future.
* Uncertainty (or risk): The amount of money to be transferred in the future is uncertain.
* Options: one party to the transaction can make a decision at a later time that will affect subsequent transfers of money.
* Information: knowledge of the future can reduce, or possibly eliminate, the uncertainty associated with future monetary value (FMV).
The subject is usually taught at a postgraduate level. [Wikipedia].
Commonsense Economics:
By John Schroy, on May 16th, 2010 | 
Eventually, at some point, without an efficient market, common stocks become mere baseball cards.
Sooner or later, some Baby Boomer, pressed to pay his bills in retirement, will find that one can’t live off the dividends of common stock and that when everyone is trying to cash out their holdings at the same time, market prices plunge to levels that seemed inconceivable for generations. But it will simply be the cost of allowing an inefficient market to flourish for so long.
This article discusses the concept of inefficient markets and the practical consequences.
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