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That article has too many flaws to go into, but the whole idea of all investments growing the economy are just false. Most of the investment dollars go to areas with little to no benefit. The (secondary) stock market, derivatives, commodity speculation, forex, etc. These produce almost no jobs, produce no goods/services, and do very little (aside from marginal liquidity) for the economy. An economy build on financial magic and imaginary money isn't sound.

That article has too many flaws to go into...

Such a cute - yet content-free - dismissal. It's also pretty clear from your "critique" that you didn't even read the article - while Sumner's examples do use a positive rate of return, his argument is independent of it.

Derivatives, commodity speculation, forex, etc, all allow organizations to hedge risks and make decisions that have higher expected economic returns.

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