It's much cheaper in the USA for most things than in South Korea. Land, house, computers, electricity, oil and gas, food, etc. The only thing that is cheaper in South Korea is human labor. If you compare taxi and babysitter, that's another matter, but then they are human labor again and you can live without taxi and babysitter while houses and fuel for heating and food are essential to keep lives going.
And average CEO's by which I mean those who run their own businesses (not just the CEO's of Samsung and LG) earn less than 1 million USDs per year. In the US, the richest people are Google, Microsoft, Oracle, Apple, etc. those who made their new wealths based on new knowledge and most of their wealths are stocks, much symbolized form of wealth. In South Korea, such a highly symbolized economy has never happened. It's still a land-driven economy here. It's natural CEO's here don't count. People here often say, "South Korea needs Samsung, but Samsung doesn't need South Korea."