Netflix added 28.62 million subscribers last year, 22.94 million of them outside the United States, which is an extraordinary achievement. The company claims that 80 million of its approaching 140 million subscriber accounts watched its heavily promoted original production Birdbox within a month. Individual and institutional investors expect the global growth to continue. The business model is relatively simple. The potential is clearly considerable, assuming the company can maintain its momentum and sustain its spending.