Here's a summary of where I'm coming from, in general, in this blog. I decided to lift most of this from a private exchange I'm having with one of our commenters; the time I have for composing articles has been significantly compressed, so I'm borrowing from my entries in that exchange.
[To paraphrase Descartes: The following few-hundred-word summary is longer than I'd prefer. I apologize for that, but I just didn't have enough time to make it shorter.]
Minifesto
Regarding my stance, I will try to be as clear and concise as I can. My judgment about economics (macro, anyway) has gone through a four-decade evolutionary process. Ideas I've discarded (after holding each of them at one time or another) include: doomsday is just around the corner; the budget should be balanced; deficits cause higher interest rates; money borrowed today by the feds must eventually be paid back without rolling the debt over; Samuelson's mathematizing of the field of economics was a good thing; utility, and its first derivative, marginal utility, improved our ability to quantify economic decision-making; and, most importantly, growth just happens (i.e., it's exogenous).
Ideas I've come to accept (some very recently), until better explanations come along, include: The decision process in the economy does not lend itself to present mathematics, because the economy is an evolutionary process driven by individual-level behaviors -- i.e., "the wisdom of crowds." Those individual-level behaviors result from a mix of motives: sometimes they are driven by strict self-interest; but sometimes a desire for cooperation overshadows strict self interest; and sometimes a desire for punishment is top priority. For the individual, the "economy" is more frequently a prisoner's-dilemma situation than an isolated, self-interest situation. Consequently, the economy is best described as a complex-adaptive system, and the most accurate and concise description I've found of how people behave is this: People respond to incentives. The best description of this, so far, is Eric Beinhocker's recent book, The Origin of Wealth. Because of reading that book twice, I belatedly discovered that at least two economists had tried to tell the world about the evolutionary nature of economies; they tried to tell us sixty years ago, but hardly anyone listened. I am now reviewing their work, and for the most part (with the possible exception of monetary economics) they nailed it. "They" were nicknamed "the Austrians" (a pejorative, to keep them distinct from what was then "mainstream" thought). They were Hayek and Mises. They tried to tell us that economies were evolutionary processes; sixty years later, with the development of the theories of chaos, complexity, cooperation, and adaptive systems, we are now beginning to understand what they were saying. Adaptation and natural selection are alive and well.
Specifically, I'm not as interested as others are in the differential equations that "reveal" macro-level marginal utility, marginal cost, marginal benefit. I think evolution (adaptation and selection) is better able to explain economic history. I think equilibrium can almost never be expected because of the nature of evolutionary processes.
Regarding the national debt, my corporate finance career makes me favor the "net interest / tax receipts" ratio as more to the point than debt/GDP. Successful corporations roll their debt over and over as they grow, and "times interest earned" is one key indicator of creditworthiness. When analyzing the federal government's creditworthiness, net interest / tax receipts is the inverse of times interest earned; it takes into account interest rates as well as debt and income levels, and that's why I think it's a better technical indicator. However, debt/GDP is easier to communicate (it's a more-established meme), and its numerator and denominator are reasonable proxies for their counterparts in the other ratio, so I use debt/GDP more frequently when writing. In any case, just as corporations can stay healthy indefinitely by achieving reasonably constant times-interest-earned ratios as they grow their debt, their assets, and their incomes, so can the federal government.
Lastly: In a fiat money system, just as in any other monetary system, it is possible for a government to get itself into creditworthiness trouble by being fiscally irresponsible. However, it is NOT possible for the government to "run out of money." The irresponsibility shows up as unanticipated inflation. If inflation is held to the 2-3% level, it is impossible for the government to "go bankrupt"; hyperinflation, and nothing else, is the closest a government can come to "bankruptcy" under a fiat money system. Therefore, although it is politically effective to tout the debt level, the interest on the debt, and the deficit level, it is nevertheless uninformative at best, if not outright disingenuous. The most concise paper on this is titled Soft Currency Economics at this link -- and it's accuracy has been verified in writing by a past vice chairman of the Fed. Until it is refuted, that will remain the basis for my judgments regarding monetary economics.
That's my current stance -- subject to change, of course, if better explanations come along.
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End note regarding Karl Marx:
If the following is ambiguous in any way, please let me know, and I'll attempt to clarify. This is important.
I have close to no use at all for Karl Marx's bankrupt, win/lose, cynical misinterpretation of the nature of the free-market capitalist economy. It baffles me that a nontrivial portion of people still cling to those depressingly false ideas, and still use them, with modernized twists of phrase, to gain political advantage -- in spite of all we've learned to the contrary in the last 150 years.