I'm not trained in economics or finance, so hopefully I don't mess up
the terminology too much.
Coming as a layperson and having experience with personal debt, I think the
general perspective is to use personal debt in limited scope and as long as
I can service the debt. So using a mortgage can often be good choice as long
as I am solvent enough, and I need a place to live anyway. Taking an auto
loan could also make sense because I need transportation and mass
transportation is not pervasive. Taking a loan from the bookie to bet on a
horse may not be a smart choice.
For business debt, and I tried to avoid using the term "corporate debt" or
"commercial debt" because I think these are industry-specific terms of art,
but for businesses to take on debt, sometimes it's a good and common choice
because the business is inherently capital-constrained and/or needs to
time-shift the capital. If you're starting a factory to build widgets, you
might need capital to acquire land, building, equipment. If you're running
a farm, you would need to time-shift capital so you can buy the inputs now
(e.g. seeds, fertilizer, farm equipment, irrigation, etc) and harvest the
crop yields later. All that makes sense for a business owner; you can
use debt as a lever because when you need money doesn't always coincide
with when you'll have money.
Now can I apply any of this understanding of debt to government debt? I
don't know. The first and foremost difference is that government with their
own currency can't ever be insolvent. They can always print more money
when they need to service their debt. I can't do that, at least not
legally duplicate an existing currency, and I would have trouble getting
others to accept a currency I made up. Neither can businesses. I don't
have a firm understanding of MMT, but I have heard that MMT mentions this
a lot. But MMT doesn't say that you can print an
infinite amount of money. Eventually, there are inflationary effects of
printing money that can adversely impact the overall economy.
I'm in the US, so I'm looking at government debt with the global reserve
currency. There's news that the US debt cross over $40T a few weeks ago.
Commentators are saying that this is unsustainable, and we need to lower
the debt or the interest payments (i.e. the servicing of the debt) will
overshadow some of the largest government programs; I think I heard that
the interest payment is 3rd largest only behind Social Security and
Medicare (and ahead of defense).
As a layperson, how should I understand this debt? I don't think I can
reason through this like personal or business debt. I watched Dr. Perry
Mehrling's lectures on the economics of money and banking, and that was
useful framing for money as currency, debt, reserve currency, and
equities, and how money going through various brokers/dealers is affected
by liquidity and illiquidity.
As a layperson, it appears that I can't treat/understand all debt to be the
same. What are some useful ways to understand how debt works at different levels?