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Re:To Understand Rising Inequality, Consider Janitors by chromatic on Sunday September 03, 2017 @09:30PM (#15165024)
It seems equally intuitive that investment drives the economy.

The economic principle you're looking for is "velocity of money". If you think of a GDP in terms of a multiplier in how often/fast money circulates, then you can analyze whether investment or spending is more important.

The second economic principle to look into after that is "marginal propensity to consume".

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