And the spread of new products is driven by the power of a new era of advertising and marketing. For example, it took the telephone roughly 100 years to reach the same level of pervasiveness as mobile phones have achieved in less than 20 years.
而新產品挾新時代廣告行銷的威力，所向披靡，例如電話從發明到普及，約花了一百年，而手機則不到二十年，就達到同樣的普及率。