# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Opening Prices
An exploration of the bid and offer prices quoted when stock or commodity markets open at the beginning of a working day.
Opportunism
The tendency for one party in a bargain to attempt to change the terms in their favour once the other party has committed itself.
Optimal Control
A method of solving a dynamic optimization problem formulated in continuous time using differential equations and optimization techniques.
Optimal Growth Theory
The analysis of the best growth path for an economy by balancing current utility loss and future utility gain. See also golden rule.
Optimism Index
A measure of economic confidence based on survey responses about economic and personal financial conditions.
Optimization
In economics, the choice from all possible uses of resources of that which gives the best result.
Option
A contract permitting the holder the right, but not the obligation, to trade a specific asset at a predetermined price on or before a future date.
Order Book
The value of orders received but not yet carried out by firms, usually in construction and engineering sectors.
Order of Integration
The minimum number of times it is necessary to difference a non-stationary time series to produce a stationary series.