There are two forms of FDI—horizontal and vertical. Horizontal FDI occurs when a company is trying to open up a new market—a retailer, for example, that builds a store in a new country to sell to the local market. Vertical FDI is when a company invests internationally to provide input into its core operations—usually in its home country. A firm may invest in production facilities in another country. When a firm brings the goods or components back to its home country (i.e., acting as a supplier), this is referred to as backward vertical FDI. When a firm sells the goods into the local or regional market (i.e., acting as a distributor), this is termed forward vertical FDI. The largest global companies often engage in both backward and forward vertical FDI depending on their industry.
Many firms engage in backward vertical FDI. The auto, oil, and infrastructure (which includes industries related to enhancing the infrastructure of a country—that is, energy, communications, and transportation) industries are good examples of this. Firms from these industries invest in production or plant facilities in a country in order to supply raw materials, parts, or finished products to their home country. In recent years, these same industries have also started to provide forward FDI by supplying raw materials, parts, or finished products to newly emerging local or regional markets.