While that's very true, there's something I've always wondered about, and I've very open to the possibility (fact?) that this misunderstanding is purely due to my naivety when it comes to business, so please indulge me:
Okay, so the price of silver (or any raw material) rises, so all products made using silver will cost more to produce... but, how much of the stock held by these stores was produced with the higher priced material? I kind of see it as (and again, please excuse the naive, small-town country boy perspective here) "Hey, this stuff is costing more to produce, so we'll raise the prices of product we already have in stock (this is the retailer talking here), and no one will question it, because it
is costing more to produce. One day, if prices go back down, we can keep our prices up for a little while, justifying it by saying that our stock was purchased during the high price period." ...just some extra profit for the end retailer?
It makes me think of a situation we had here in Australia a few years back: Cyclone Larry (yeah, we even have a sense of humour in naming our natural disasters

) touched down and wiped out nearly all of of Queensland's banana crops. The prices of banana's in supermarkets went from $2.99/Kg to around $15.99/Kg almost overnight. That's understandable, perishable product, high turnover etc, but what really got me, is that, while limited stocks of banana's from QLD were coming in at the huge prices, banana's from WA (on the other side of the country, completely unaffected by the cyclone) were suddenly also commanding the high price... Supply and demand? I guess so, but beyond that, it was just profiteering, those banana's weren't costing any more to bring in than they always had, and a LOT ended up being wasted, because people said "Heck no, I ain't paying $15.99+ for freakin bananas! That's bananas!".
Anyway, like I said, naivety in big business is probably to blame for my misunderstanding, I grew up in a town where the cost of a product was worked out by wholesale+overheads+profit margin, if wholesale price went up, then retail followed, but not before (and in a small community, quite often
after, otherwise people get upset). ..these are just rambling thoughts on an early Sunday morning...