Answer:
The thesis is:
The driving cause for Starbucks' recent volatility is its accelerated overgrowth which caused the company to lose much of its identity.
Explanation:
The thesis in this excrept, is expressed in the explanation the researcher has to determined the causes of the recent volatility of Starbucks.
The thesis would be trying to prove, how the rapid growth of Starbucks company has now slowed greatly due to changes in the bussiness climate, and in the company preformance.
The investigation would be lead by the thesis, that would guide the investigator into proving how the volatility of the fast growth and then the decrease is due to all the changes.