GDP is a useless measure of economic productivity because it tells you only how much money the products are worth, not how hard it was to actually make them. ECI, or Economic Complexity Index ranks countries by the complexity of the products they make. So, we have the following: 1. Japan - 2.29 2. South Korea - 2.12 3. Switzerland - 2.08 4. Singapore - 1.99 5. Taiwan - 1.96 ... 14. USA - 1.48 ... 18. China - 1.40