how do banking and insurance facilitate trade and commerce
The answer to your question is already covered in our revision notes of Business Studies XII. Follow the given link and scroll down to the topic 'Types of Auxiliaries to trade' to view the same.
https://www.meritnation.com/cbse/class11-commerce/revision-notes/business-studies/business-studies/nature-and-purpose-of-business/1161_5364
https://www.meritnation.com/cbse/class11-commerce/revision-notes/business-studies/business-studies/nature-and-purpose-of-business/1161_5364