The mirage of the trillionaire: Elon Musk and the power of expectation

 It’s official — Elon Musk has become the world’s first trillionaire. The figure is staggering, but it also raises an important question: What exactly do we mean when we describe someone as “a trillionaire?”

The answer lies largely in market capitalization, the value investors assign to a company based on the price of its shares. Yet market capitalization is often misunderstood. It is not a direct measure of cash, profits, assets, or even business performance. Rather, it reflects collective expectations about the future.

In that sense, it is as much a measure of belief as it is of economic reality.

Few examples illustrate this dynamic more clearly than Tesla. At various points over the past several years, the electric vehicle maker has commanded a market valuation exceeding that of several major traditional automakers combined. Meanwhile, established manufacturers such as Toyota continue to produce and sell substantially more vehicles, generating greater revenues and delivering consistently strong profits.

The difference in valuation is not simply a reflection of current operations; it reflects investors’ confidence in Tesla’s future role in transportation, energy, artificial intelligence and........

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