There are several case studies and examples that you can study for commerce. Here are a few examples:

1. McDonald's: McDonald's is a global fast-food chain known for its successful business model and marketing strategies. You can study how McDonald's expanded internationally, adapted its menu to different cultures, and implemented effective marketing campaigns.

2. Amazon: Amazon is an e-commerce giant that revolutionized the retail industry. You can study how Amazon grew from an online bookstore to a diversified platform selling various products and services. Additionally, you can learn about their customer-centric approach, supply chain management, and use of data analytics.

3. Apple Inc.: Apple is a leading technology company known for its innovative products like the iPhone, iPad, and MacBook. You can study Apple's product development process, marketing strategies, brand loyalty, and supply chain management.

4. Coca-Cola: Coca-Cola is a well-known beverage company with a strong global presence. You can study Coca-Cola's marketing campaigns, brand positioning, supply chain management, and how they adapted their product portfolio to changing consumer preferences.

5. Tesla: Tesla is an electric vehicle manufacturer that disrupted the automotive industry. You can study Tesla's business model, marketing strategies, technological innovations, and sustainability initiatives.

These are just a few examples, and there are many more case studies available for different aspects of commerce such as marketing, operations, finance, etc. It is beneficial to study a variety of case studies to gain a comprehensive understanding of different business practices and strategies.