What shift in focus is described as a core tenet of building modern career longevity?

Answer

Being an asset in the market rather than an asset to a company.

A core tenet of modern longevity involves shifting the focus from being viewed as an asset primarily benefiting a specific company to being viewed as an asset that commands value in the open market due to a continuously refreshed skill profile.

What shift in focus is described as a core tenet of building modern career longevity?
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