The following data show the demand for an airline ticket dependent on the price of this ticket. 
For the assumed cubic and log-log regression models,Demand = β0 + β1Price + β2Price2 + β3Price3 + ε and ln(Demand) = β0 + β1ln(Price) + ε,the following regression results are available. 
Which of the following is the price elasticity of the demand found by the log-log model?
Definitions:
Trade Promotions
Marketing activities executed to increase product demand, typically through discounts or special offers to retailers or wholesalers.
Subcontracting
The practice of hiring a third party to perform tasks, provide services, or conduct operations that are normally or could be done in-house.
Predictable Variability
Patterns or changes in demand, supply, or other business factors that can be anticipated based on historical data or known trends.
Demand
The quantity of a product or service that consumers are willing and able to purchase at various prices during a specified time period.
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