Sunday, August 19, 2018

Calculating Inflation with a Practical Example

Everyone needs to know how to calculate inflation.  Here is how, with a practical example.  I have an old copy of Glory Road by Robert Heinlein from 1963 priced at $1.75.  Wow!  Today that book sells for $16.99.  To calculate the inflation that drives a book from $1.75 to $17 dollars we set up this equation after calculating (2018 - 1963) = 55:
1.75 ( 1 + x)**55 = 17.0
To solve with python, you first do "import math" into the IDLE GUI.

>>> import math
Here is the solution to the equation.  We all remember algebra, right?
>>> 10.0 ** ( math.log10(17.0 / 1.75) / 55.0)
1.0422044542587574
So 1.0422 is 1 + x, meaning the inflation rate for this book is 4.22% over 55 years.
The average inflation rate is presumed to be 3% as I stated in "Teaching Our Children About Investments" (July 29, 2018), but it is 4% for this book.

Going from $1.75 to $17 is about a 10 fold increase.  I saw this in my lifetime.  I was buying stuff in 1963.  You have to tell your kids that everything they buy today will cost at least ten times more when they are older.  You have to tell them that inflation is a threat to them and their future.  Think about it.  If you have a big basket of groceries and you pay $200.00, like I have done, that same basket of groceries will cost your children $2,000.00 in their lifetime.  It might be 50 years later, but  it is coming like the sunrise if we cannot cannot drop inflation back to about one percent.

Inflation is a hidden tax imposed on us by our own government.  Milton Friedman said in "Money Mischief: Episodes in Monetary History," that, “Inflation is always and everywhere a monetary phenomenon.”  That is a fancy way of saying the government does it to us because it sets monetary policy and controls the money supply.

We all should be getting after our elected officials about inflation and deficit spending.  The mass media, like television news, distracts us away from what is important to us with what I would call "circus sideshows."  They have been running an anti-Trump circus sideshow for about two years now.  They have lost their minds.  Our TV news media are much like Emperor Nero fiddling while Rome burned.

We need to stay focused on what is important to our families and our future.  Inflation is one of the important items we do not talk enough about.
Look at the huge difference between 4% and 2% inflation over our adult life time, which I will call 60 years, which is age 25 to age 85.  (Cut and paste the following from Python IDLE GUI)
>>> 1.04 ** 60
10.519627408052855
>>> 1.02 ** 60
3.2810307883654146
Prices going up by a factor of 10 is nuts, but it is what we have at 4% inflation.  Going up by a factor of 3 is more manageable, which is with a 2% inflation rate.  I think I will write my congressman!

Robert

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