Back in 1979, before computers, I imagine many more newspapers were sold.
The decline, at least in the Netherlands, appears to have started after 2000:
(The big, odd jump upward in AD circulation around 2006 is because several regional papers were folded into it around then, BTW.)
I wonder if kits were cheaper or more expensive then, taking inflation into account.
A while ago I looked at some numbers, but I don’t remember exactly, so let’s work that out again.
I remember that in the mid–late 1980s, a Tamiya M113 kit cost ƒ34.95 and their 88 mm Flak was ƒ52.95 (the most expensive 1:35 scale kit my local model store carried, which is why I remember that number

). Converted to modern currency at the official exchange of €1 = ƒ2.20371, that makes €15.86 and €24.03, respectively; however, that is the naïve way you see people do all the time, unadjusted for inflation. According to
this inflation calculator, ƒ34.95 in 1987 is €29.32 in 2022, and ƒ52.95 is €44.42.
Now, current prices for those same kits:
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Call it two-thirds to half the real cost of the same kits 35 years ago, depending on where you buy (and how accurate those prices are, of course, because my experience is that the ones shown on Scalemates don’t always match what you see on the actual web store).
But wait, that’s the exact same kits. What if we compare to more modern kits of the same subjects, on the basis that they were the best you could buy
then but not anymore?
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The M113 isn’t quite the same, because AFV Club doesn’t make an M113 without the additional shields, but I don’t recall what the Tamiya version of that cost when it was released in the late 80s. Still, in general, I would say that on the whole, modelling has become a rather more expensive hobby than it used to be …