Title: What are examples of industries and companies that do exist, and that most people have never heard of?<p>One example is to open one&#x27;s wallet and look at the back of the cards. Odds are, at least one of them will say &quot;Gemalto,&quot; which is the largest SIM card manufacturer and has about 50% of the world market for banking cards. Most people don&#x27;t know that this is a several billion dollar industry.<p>What are other examples?<p>Idea for this thread came from https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=23534319
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