One of the remarkable changes occurring in the world these days is the extremely rapid diffusion of smartphones. As reported widely in the local press, a new study shows that South Korea ranks fourth in the world in smartphone penetration. The Korea Joongang Daily, in describing a report issued by the research arm of KT, noted that "...one of the biggest changes in the global market this year has been the rapid rise in new markets, such as Thailand, in the use of smartphones. In that country, the smartphone penetration rate rose 23.7 percentage points in one year. Two out of three Thais (63.7 percent) now carry a smartphone. Other emerging markets such as Brazil, Malaysia, Vietnam, Poland, Argentina, Turkey, Russia and Indonesia saw an increase in penetration of more than 15 percentage points over the past year."