How are business products classified?

"Products bought by businesses or institutions for use in making other products are called business products. These products can be commercial, industrial, or services products. A commercial product would be an 18-wheeler truck used by a major transportation company as part of the business. An industrial product might be a major robotics installation in a state-of-the-art manufacturing facility. A services product (for business) might be telecommunications consulting for a large corporation setting up offices in Singapore. Business products are classified as either capital products or expense items. Capital products are usually large, expensive items with a long life span. Examples are buildings, large machines, and airplanes. Expense items are typically smaller, less expensive items that usually have a life span of less than a year. Examples are printer cartridges and paper. Industrial products are sometimes further classified in the following categories."