“Only invest in businesses that you understand.” It’s one of Warren Buffett’s main principles. And with his amazing track record, it doesn’t come as a surprise that it’s being adopted by both professional and retail investors all around the world. It indeed is a sound advice, but one could also argue that it adds risk to your portfolio if an industry of great importance now and with great promise for the future is totally ignored. With 89 years, the legendary investor isn’t the youngest anymore, which might make it harder to grasp the new economy that’s been building over the last…

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