An add-on represents a diversification of a business endeavor. When a business grows vertically, it is said to be "diversifying its business." When a business grows horizontally, it is said to be "expanding."

So when a carpet cleaning company adds more trucks and cleaners to its business, it is growing horizontally. And when a carpet cleaning company adds water-damage and restoration to its business, it is said to be "growing vertically". It is the same with crime scene cleanup's horizontal and vertical growth.

It makes a lot of sense to grow a business vertically, meaning diversifying when business grows slow. Likewise, it makes sense to add-on by leaning more about different fields. So if a carpet cleaner knows about water damage and restoration, they may use this add-on business to help their slow carpet cleaning business.

We must keep in mind that adding onto a business with a different business field poses risks. There's time lost to training for a new trade. There's equipment and the training to use this new equipment. It makes sense, then, to add-on business activities that make use to an already existing inventory.

A useful add-on with sure advantages would be something like learning about the Internet. Learning how to market your business while increasing your own writing and web building skills. It's not so difficult with book reading. It's always better to do your own Internet work if your money supply remains low. This type of training easily leads to helping others. It even become a form of vertical growth when money flows to your wallet.-