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Is it any wonder middle class folks have so much displaced anger?
In the beginning, there were institutions...thoughts on institutions, economics and other random topics.
So whereas someone who can borrow and lend freely will spend very little of a temporary rise in income, someone who is liquidity-constrained — wanting to spend more right now, but unable to borrow — will spend all of that temporary rise.The graphs in the link help illustrate why this can be true. Also note that he is using a dynamic model - usually the tool of the neoclassicals - and not some trumped-up "in the long run we're all dead" argument. It also says a thing or two about why tax cuts (or, equivalently, transfers) to the lower segments of the income distribution might have a greater macroeconomic impact.