By "pricing trends" do you mean the price history for any one coin, or do you mean the current price for any one coin? Chris
This looks like an NGC graph to me. http://www.ngccoin.com/price-guide/...d-57/1885-25-ms-53-price-history-coinid-17837
Click on those prices next to the red/green arrows and voila, you get a trend graph. Example: http://www.pcgs.com/pricehistory#/?=82867-65
Though, more useful is the Auction Prices Realized feature on PCGS. I only trust Price Guide prices to be relative, but not very relevant.
You want graphs, here there be graphs - http://www.pcgs.com/prices/frame.aspx?type=coinindex&filename=index Not for specific coins but rather for the entire coin market and specific segments of it. Which is far more important that any specific coin for it is what happens in the market as a whole that determines what happens with every specific coin.
It really depends on the type of coins you're referring to. Heritage prices realized are good for coins valued above $200. Great Collections includes lesser-valued coins. Ebay will be a DIY project with error-prone results, but you should be able to find stuff in the $10-$20 range. PCGS auction prices (http://pcgs/auctionprices) looks like it aggregates stuff from several major auctions nicely (HA, Goldberg, Legend, David Lawrence), but not GC and only when the coin is well-defined in the Ebay listing. It looks like it doesn't have Stacks/Bowers auctions, perhaps a testament to the crack IT staff at SB.
Just want to point out, the Jan 1970 to Jan 2015 annualized return there is 9.8%, while the S&P 500 was 10.5% for the same period. But I suspect something odd is going on in the 1970's so let's take July 79 to be the value 20,000. The annualized return from then is only 3.5%, which is basically the annualized inflation rate for the time period, compared to around 12% for the S&P500. I suspect over long periods of time this trend will continue, coins as an asset class will follow inflation, with the standard past history does not predict future results disclaimer...
Numismedia shows past 30 day price change and price change calendar year to date. http://www.numismedia.com/fmv/fmv.shtml
PCGS will show you price history, going back 10 years or so for many series. Hall was just talking about this feature. https://www.youtube.com/embed/30UC6GLmMhY
Results are TOTALLY non-comparable. Like comparing baseball stats today vs. 1880's. Or stock returns pre-Civil War. The 1970's saw the end of fixed exchange rates, double-digit inflation, and a 20-fold rise in the price of gold PLUS a mini-bubble in coins. I'm not sure what the index is comprised of but it may not have been investable and it CERTAINLY was not liquid. Disco, Jimmy Carter, and gas lines. For any comparison, ROLLING PERIODS eliminates the bias of where you start measuring and sometimes where you end. For coins -- or any other illiquid asset -- it biases the results greatly. Coins will follow the underlying metal prices and supply-and-demand. Inflation will certainly help but you could be waiting decades for a resumption of even moderate 1980's inflation.
Wait...collecting slabs? Oy, for the sake of hope, I'll assume that that's not exactly what you intended to convey.
Golly, you're making me feel like a heretic, like I ought to be persecuted! We're collecting commodities, these days, Eagle. That's what the TPGs have us doing. What do you think market grading is? It's money grading. Money is what controls it. Ah, "eye appeal." What eyes? Whose eyes? They took our eyes out of our heads years ago and sent us walking out of the room before we knew anything was missing.
Anybody got photos of 2 coins where 1 is an example of technical grading and 1 is of market grading ?