1. Commerce has evolved from barter systems to modern economies. Early systems faced constraints like the lack of a common currency that hindered trade.
2. Businesses aim to earn profits through various economic activities like employment, professions, and operating businesses of different sizes, ownership structures, and functions.
3. Industries are classified based on their function in the production process such as primary, secondary and tertiary industries, and by factors like scale and the technologies employed. Commerce facilitates trade between producers and consumers.