It is a global thing, so not just one factor in particular, but the biggest gripe I have is that shops will for the most part still mark everything up 100% when and where they can - at least in Australia, but I know margins are less in US and other places round the world.
As far as deck prices, it has gone up $1 or $2 in costs to produce a deck, so depending on how many hands it has to go through, everyone is also making enough margin, if that is through three sets of hands to get to the consumer (more likely four or sometimes more) then the end price is going to be at least $10 to more likely $20 increase in prices at the retail end, regardless of RRP.
So as far as the path, the manufacturer to the wholesaler, then to the distributor, then to the shop, then to the customer. Sometimes another distributor in between too, if it is going to a different country or through other channels than the big distros.
I know everyone has to make money, but if a shop in AU here has been making $50 from a board sale for the last how ever many years, (wholesale at $50 and retail at $100) how is it now they go to making $70+ (wholesale $60 - $70 and retail for $140 - $150) from the same deck since covid?
And that all comes from a $1 production increase from the manufacturer.
* Yes I have worked in retail for almost 30 years, so I know how it all goes.