How does simultaneous consumption affect economies of scale?

A product's ability to satisfy a large number of consumers at the same time is called simultaneous consumption. Lenovo needs to produce a laptop for each customer, but Microsoft needs to produce its Windows program only once. Then, at very low marginal cost, Microsoft delivers its program over the Internet to millions of consumers. Music producers and video game makers have similarly low marginal costs when delivering their products to additional customers. Because their marginal costs are so low, their average total cost of output declines as more customers are added and the fixed costs of product development are spread over more and more users, resulting in economies of scale.