I don't think you have understood my initial point. Please, read my first comment again. I'm not saying that Amazon won't overtake Walmart, but that tech compa

I don't think you have understood my initial point. Please, read my first comment again. I'm not saying that Amazon won't overtake Walmart, but that tech companies benefit from future projections factored into their valuations, while other non-hyped businesses don't. If the argument is that "software engineers make the best CEOs", it seems more likely that companies in the software industry simply get higher valuations for the aforementioned reasons.