Hi,

The benefits of Mass Communication are listed below:

• People can stay connected with the help of mass communication all around the world e.g. Computer, Mobile Phones etc.
• Permanancy, which refers to  period for which a medium can hold its message thereby making the message reviewable. A reader of a book, newspapers and magazines can read and re-read and store it for a long term.
• It is also used for launching new products or launching business of the organization.
• The news of product and business of organization over a large area of country and the world in a given time.
• In MC, information is reached rapidly and continous disseminates to large and vast number of heterogenous audience. 
• Most important and common benefit is entertainment which is an important part of audience.
•  Mass communication is only the tool for creating foreign market of a product. It is also used for creating new market.
•  Advertisement is the biggest part of marketting. It can be easly done with the help MC.

Hope this helps. All the best!!