How Can I Predict Inflation in the Face of Such a HUGE Drop in Consumer Spending?

Apparently consumer spending declined in March by nearly 8%, by far the largest drop in recent history.

How can I predict inflation when there has been such a drop in demand?

One big reason is that inflation arises when there is too much money chasing too few goods, and the recent drops in GDP have been monumental.

Here's more of an explanation for my predictions:

The drop in consumer spending provides an impressive graph, to be sure! From it, alone, it looks as if a lack of consumer (and undoubtedly business) demand will keep the lid on spending pressures, at least in the short run. 

 

The argument coming from me and other monetarists [channeling Milton Friedman, I hope] is that there's been a massive reduction in output, as well, and it won't get back to 2019 levels for a long time; at the same time there has been and will continue to be a massive injection of spending power (the money supply) as central banks monetize the rapidly growing gubmnt debt. Unless the extra money supply is soaked up somehow as we come out of the depression, it'll create inflationary pressures. 

 

Consider the old quantity equation of money: MV=PQ, where

M is the money supply

V is the number of times each dollar turns over during the year in spending for final goods and services.

When interest rates are low, this number also tends to be low because the cost in terms of foregone interest income tends to be minor. When interest rates are high, people move money into earning assets more quickly and the 'Velocity' of money tends to rise.

P is the overall price level

Q is the rate of real output [i.e. Real GDP]

 

The equation is a tautology, with V being the variable that makes it true by definition.

 

But it's clear that V is pretty low right now (people fleeing to cash for security, hence not turning money over so rapidly; also because interest rates are low). So current increases in M are not having much impact on P despite a falling Q. 

 

As the economy emerges from the depression, Q will grow back to 2019 levels, but V will also grow. And M will be much higher than the 2019 levels, meaning P will have to grow. 

 

When and how much?

As Friedman is famous for having said, "It's a long and variable lag."