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I agree with Dan it is likely a typo. Some definitions (using your notations) Investment : $f_0$ Investment one year later : $f_1$ Net income : $f_1 - f_0$ ROI: $-1 + \frac{f_1}{f_0}$ It follows that the correct code should be ROI = (goog/goog.tshift(-365) -1)*100


I don't know if your statements are true. By what margin is the German stock market small? And the only bank that did matter on the international level (Deutsche Bank) is far from being large and powerful. That being said, your notion might have to do with the fact how the German economy has been organized since WWII. The Rhine capitalism used to be, among ...

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