Nebula Inc. is an American smartphone manufacturer that sells smartphones in 36 countries across the globe. Nebula makes both low-end and high-end smartphones to cater to the needs of different markets across the world. There is a high demand for Nebula's low-end smartphones chiefly in developing nations. Its high-end smartphones have buyers mostly in developed nations. One of the challenges that Nebula faces is planning its sales strategy to suit different markets. Given this information, it can be said that Nebula's smartphones are an example of _____.