From World War II to 1961, comic books were 10 cents. During the war, that was equivalent to about $1.50 today. In 1961 it was equivalent to about 80 cents today. When they upped the price to 12 cents the same year, that was equivalent to about $1.00.
In the late 70's, the price of comic books had gone up to 35 cents. That was equivalent to today's $1.40.
By the mid-80's comics were 75 cents, which was equivalent to $1.75.
So as you can see, throughout the decades, comics have cost an average of today's $1.50. Computers have made comic book production costs less. Yet most single issue comic books are now between $3 and $5!!! Why is this?