Chrystia Freeland: The rise of the new global super-rich
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Though the mega-rich may be spending more on education, access to quality education has never been cheaper or as easily available (I just took a University Machine Learning Course on Coursera and didn't pay a thing).
David Karp was likely on his way to being an upper-middle-class web developer, who then created Tumblr and joined the mega-rich. It wasn't a 0-sum game. Nobody had to loose for Karp to win.
Lastly, her concerns for what the current or future environment holds for the working class, the market decides the rates of pay, and it is due to the market that incomes have somewhat stagnated (if they truly have). The mega-rich may be getting richer on the backs of those workers, but they are also loosing billions in the same environment. Their is a constant transfer of wealth, and as long as their is somebody else willing and capable of doing your job for less, corporate fiscal responsibility for the most part requires that the lower cost employee get the job.
We seem to not complain when prices for goods decline over time, but don't recognize that those declines are matched by a decline in purchasing power. It isn't the responsibility of business to ensure that we are constantly making more and more money, it is their responsibility to ensure that we are able to live a comfortable and happy life so that we can come back to work for them day after day.
GM liked to control all parts of their value chain - GM parts (I.e. Delco Electronics), GM service centers, even GM financial services.
Facebook's strategy is more akin to owning the toll roads, and letting other people build the cars. Hence, Facebook doesn't provide social media management services, app development, or FB media buying - external businesses do.
Therefore - comparing the two businesses directly in terms of job creation is not comparing apples to apples - there ARE hundreds of thousands of people employed in businesses directly related to Facebook's existence, they just aren't directly on the FB payroll.
Granted, while I feel this specific critique doesn't necessarily significantly weakens her overall thesis, her usage of comparisons like this one makes me cautious of accepting her other examples I am less familiar with at face value.