This paper examines the effects of sorting and mixing on academic performance of high school students in South Korea. The Korean government has vigorously promoted mixing for more than three decades, replacing competitive entrance examinations at individual schools by a lottery-based enrollment...

With the prevalence of smartphones, it is important to understand the relationship between the smartphone channel and the computer channel. In this paper, we examine the extent to which smartphones substitute for or complement computers. We utilize unique panel data on individuals’ smartphone...

Quantifying the consumer welfare of smartphones is important in understanding the new innovation's overall benefit to the economy. I empirically estimate consumer surplus from smartphones and explore the market and policy implications of the welfare estimates. I employ newly available Korean...

I examine whether bundling of telecommunications services makes individuals less likely to switch their service provider because of increased switching costs. Using a detailed survey dataset from the Korea Information Society Development Institute (KISDI), I find that Internet subscribers who...