It is believed that the sales volume of one-liter Pepsi bottles depends on the price of the bottle and the price of a one-liter bottle of Coca-Cola. The following data have been collected for a certain sales region. 
The linear model Pepsi Sales = β0 + β1Pepsi Price + β2Cola Price + ε and the log-log model ln(Pepsi Sales) = β0 + β1ln(Pepsi Price) + β2ln(Cola Price) + ε have been estimated as follows: 
For log-log model, interpret the estimated coefficient for ln(Cola Price).
Definitions:
Longitudinal Study
A research method that involves observing the same subjects over a period of time, often years or even decades, to track changes or development.
Selective Optimization
A strategy focusing on maximizing performance in key areas through the selection of specific tasks, optimization of resources, and compensation for declines in other domains.
Skill Areas
Categories or domains of competencies and expertise that individuals can develop, such as communication skills, analytical skills, or technical skills.
Concentrate
To focus one's mental or physical effort on a particular task or activity without distraction.
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