Relative Value between Grades

[jmg3637]

I have developed a spreadsheet that I have been using for trading and wanted to see how others felt about the relative value between grades, especially at the higher end.

 

When I first developed it II based it off the FINE (6.0) value in guide, but for comparison I am basing it on multiple of G.

 

Anyway the new scale was

GRADE Multiple per 30F

2.0 1.0 10.0

2.5 1.3 12.5

3.0 1.5 15.0

3.5 1.8 17.5

4.0 2.0 20.0

4.5 2.3 22.5

5.0 2.5 25.0

5.5 2.8 27.5

6.0 3.0 30.0

6.5 3.9 39.0

7.0 4.8 48.0

7.5 5.7 57.0

8.0 6.6 66.0

8.5 10.1 100.5

9.0 13.5 135.0

9.2 18.0 180.0

9.4 36.0 360.0

9.6 54.0 540.0

9.8 72.0 720.0

 

 

 

So the last column represents a book that goes for 30 in fine( 6.0) I had never really developed the formula beyond the 9.0 range I did find a much wider spread starting with the 8.0 ( so for my calculations anything 6.5+). I believe that I used a 6.0 for a FV previously and it seems closer to 6.6

 

Hope this makes sense to a few other numbers geeks out there.

 

 

 

[thunsicker]

I would think there are so many things that go into a price that it would become daunting if you weren't able to have a computer program that took everything into account.

1) Age of comic (GA, SA, BA, Modern)

2) Number of each grade on census (Is there a single higest graded? 100 at the highest grade?)

3) How much of a key is the comic (I'm think of IH 181 where below 6.0? the price doesn't go down much no matter what)

etc.

 

Good luck with your work on this.

[jmg3637]

Wow nearly 150 views and only one comment.

This is not really a computer program, just an oversimplification of the formula that is used in Overstreet.

 

This is the approximation of the pattern I noticed while working on a large Four Color deal. I was updating the Fine value and noticed that every issue had experienced a significant decrease while in most cases the 9.0 value had actually risen.

 

Anyway here is the old scale for comparison purposes. I really did not attempt to factor in grades above 9.

 

GR X Value

2.0 1.0 10.0

2.5 1.3 12.5

3.0 1.5 15.0

3.5 1.8 17.5

4.0 2.0 20.0

4.5 2.3 22.5

5.0 2.5 25.0

5.5 2.8 27.5

6.0 3.0 30.0

6.5 3.8 37.5

7.0 4.5 45.0

7.5 5.3 52.5

8.0 6.0 60.0

8.5 7.5 75.0

9.0 9.0 90.0

9.2 9.6 96.0

9.4 10.2 102.0

 

The upshot of this is that even if the Fine (6.0) value remained the same the VF value increased 10% and the VF/NM (9.0) increased by close to 50%.

 

 

 

[Biographer75]

What about page quality? I've seen the same grade CGC book at different prices - especially if a copy has white pages.

[thunsicker]

One thing that I noticed from your numbers is that I think you are having too small a bump on 7.0/7.5. The inflection point (at least on books I collect) seems to be 7.0. There is a much larger bump from 6.5 to 7.0 and 7.0 to 7.5 than from 5.5 to 6.0 and 6.0 to 6.5. This may be due to different collecting focus.

[jmg3637]

Thanks for the real world input. I am basically using straight line interpolation between 6.0 and 8.0.

[rodan57]

One thing that I noticed from your numbers is that I think you are having too small a bump on 7.0/7.5. The inflection point (at least on books I collect) seems to be 7.0. There is a much larger bump from 6.5 to 7.0 and 7.0 to 7.5 than from 5.5 to 6.0 and 6.0 to 6.5. This may be due to different collecting focus.

 

It is for me.

 

This is where a book stops looking like an old comic book and starts looking like a well-preserved old comic book.

 

I can take a look at a Silver Age 6.0 of what I might like to own and tell myself that I'd rather wait -- and pay twice or three times as much for a much nicer 8.0 or 8.5.

[1Cool]

There are a ton of factors which make it very difficult to have a simplified chart but I like the data I'm seeing. I'd say you data is more relevant for lesser demand books like the Four Color books you were using. My simplified chart would show a 25% difference between all half grades (4.5 to 5.0) and 50% difference between full grades (6.0 to 7.0) until you get into the higher grades. I use a simplified jump of 50% between 9.0 to 9.6 and then I usually double between 9.6 and 9.8.

 

So many variables which could tweak the percentages but this is what I've seen as a starting point. I think your data is fairly close to my rule of thumb.