The point estimator 
is said to be an unbiased estimator of θ if Var( 
)= Var(θ).
Definitions:
Price
The amount of money expected, required, or given in payment for something.
Price Rigidity
Characteristic of oligopolistic markets by which firms are reluctant to change prices even if costs or demands change.
Demand Curve
Depicts how the quantity demanded of a commodity varies with its price, commonly shown as a downward-sloping line on a graph, reflecting the inverse relationship between price and quantity demanded.
Price Leadership
Pattern of pricing in which one firm regularly announces price changes that other firms then match.
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