The following case: "Uber and the sharing economy: Global market expansion and reception." Please analyze the case and address the following questions:

1. How is the sharing economy characterized? What challenges does this economic model face?
2. What are Uber's core competencies? How do such core competencies allow Uber to build competitive advantages in the sharing economy?
3. What challenges does Uber face during global expansion? Is Uber's business model vulnerable since competitors such as Didi Kuaidi in China and Ola in India can imitate its business model? Can Uber overcome it challenges from foreign governments? Should it try to collaborate with these foreign governments, and if so, how? Should Uber try to collaborate with domestic competitors in foreign markets such as China and India, and if so, how? Outline Uber's strategic options in global expansion and analyze the pros and cons of these strategic options? Overall, what strategies would you recommend for Uber to expand globally?
4. Due to the furious competition from rivals in global markets (China, India, or Southeast Asia), should Uber leave these markets and focus only on the U.S. market? What are the pros and cons of Uber's choice?