Open Window, a brand well known for producing vinyl and aluminum window blinds, introduced a new range of faux-wood shutters and vertical blinds a few years ago. Because most of its products could be produced using the same resources and technology, the company's cost structure lowered, while its product portfolio widened. In this scenario, which of the following value and cost drivers is Open Window applying? Group of answer choices mass customization economies of scope learning-curve effect network effect