Significant technologies or services in any industry provides higher profit margins, because customers have no where else to get your products, said another way, their is less competition when a company has a technology advantage or service innovation.

The Home Depot is increasing their services business for customers, because it offers better margins and profits.

Some companies, such as auto makers have services businesses, which contribute a significant amount to revenues. Services businesses can grow during recessions, because new purchases (with less services needed) are delayed. A strong service business is a good complement to auto markers, because it lowers their risk when new sales are difficult to obtain. …