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HGVC: Flamingo & Anderson Ocean Club
Vacation Village: Woodstone at Massanutten and Grandview (RCI Points) & the Colonies
it might defy logic but it’s true. Each TDI chart is specific only to the region it represents. A 100 TDI in Hawaii would like have much more trade power than a 150 in Orlando or Williamsburg or Branson for example.
A.) I agree each "TDI chart is specific only to the region it represents." Good evidence of this is that II has a different chart for all the different regions.
B) "A 100 TDI in Hawaii would have much more trade power than a 150 in Orlando....." -- I agree with this, but it also seems completely extraneous to this discussion to me. TDI is a measure (or approximation) of exactly one thing: "travel demand." It is an independent variable that one cannot use in isolation to calculate trading power, rental value, or how many red-headed people may live in a 15-mile radius.
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I have never seen where II has said it is not comparable across regions .... and I have never seen where they say it is either.
The whole purpose of an index is to have a comparable measure. A common dictionary definition is "a number used to measure change in prices, wages, employment, production, etc.: it shows percentage variation from an arbitrary standard, usually 100, representing the status at some earlier time : in full index number."
My working thesis/assumption is that it is comparable across regions. It is certainly calibrated to something independent of each region (not every region has a top week at 150 or a low week of 0).
I am not saying I am right. But I am saying I have put some thought into it. If someone knows my theory is wrong, I would love to see the evidence (either from II or through deduction) showing that it is not a measure that can be compared across regions. Now, it is obvious it is an approximation and not exact (even within a single region). We all know not every 150 TDI week is created equal. But I do not see why it is not a number measuring demand that can be used to make relevant but inexact comparisons from one region to another.