A Stratocaster is one of the most cost efficient guitars ever constructed. In fact most parts of these guitars can be made by machines. Only the final assembly is made by humans. You can build this guitars fast and by big numbers. No matter whether you place these CNC machines in the US or in Korea. The only part that costs money are the few work-steps done by hand. The costs and the individual skill-level of these few steps make the biggest difference between a Chinese-made Strat and an Us-made product. Does it justify the big difference in pricing? You decide. On the other hand I assume that a guitar like a Gretsch demands for much more handicraft. The costs of handicraft in Japan or USA are much higher than in Korea or China. That`s why there is such a big difference on the pricetag of an Electromatic compared to a MIJ Gretsch.