Yugoslavia - Industry set

"Real" prices tend to depend significantly on region. Older US stamps tend to retail for much higher within the US than outside the US. On the other hand, non-US stamps are much cheaper here in the US, simply because of demand. I know of many international dealers who bought up supplies here in the US and resold them overseas, because the actual retail for some stamps were noticeably higher overseas.

Most US dealers don't bring/list post-WWII Yugoslavian stamps because the demand is low in US. That is unfortunate, because there are some really really well-designed and attractive Yugoslavian stamps. However, the dealers do have them -- they just won't bother listing them unless the see a noticeable demand. Otherwise, they just wait until somebody asks for it, then they look for it. The Scott value in 2009 was $22.75, making a net change of +10¢ over the past 6 years. I didn't check, but I suspect the Michel/SG prices probably increased far more. As I mentioned, it's a localized pricing based on local demand.

If I really wanted to get that set, it would not be difficult to find a dealer in the US and get the MNH set for 50% of Scott catalog. In Europe, I would very unlikely come close to getting a 50% discount. In US, supply exceeds demand for this set. In Europe, the demand is comparable to the supply.

Location makes a lot of difference. Quite frankly, I don't recall ever having paid more than 33% of Scott catalog value for a modern MNH non-US stamp (stamps sold at face value or discount off face value not included). Getting a premium VF MNH US stamp at that discount would be considered a bargain. One of the reasons why I focus on non-US stamps rather than US stamps.