# XKCD valuable shoebox revisited **URL:** \ **Category:** Factual Questions\ **Created:** [September 6, 2016, 8:28pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224 "2016-09-06T20:28:37Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![boffking](https://avatars.discourse-cdn.com/v4/letter/b/858c86/32.png) [@boffking](https://boards.straightdope.com/u/boffking)\ **Post date:** [September 6, 2016, 8:28pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/1 "2016-09-06T20:28:37Z")
[https://what-if.xkcd.com/108/](https://what-if.xkcd.com/108/) I would like to see this redone with a few rules added to it. What is the maximum value that can be put into the shoebox with the following stipulations: 1. Contents must be legal to purchase in the USA without a prescription or special license. Products where age is the only restriction, however are allowed. 2. No financial instruments, gift cards, vouchers, tickets, or real estate deeds. 3.Rare collectibles are allowed, but only to the point that they actually exist. No speculating on the value of hundreds of copies of a one-of-a-kind item. 3. Since digital goods usually can’t be resold, they do not count either. Boxed copies are allowed since they are transferable if not used. ---
**Author:** ![Shagnasty](https://avatars.discourse-cdn.com/v4/letter/s/9dc877/32.png) [@Shagnasty](https://boards.straightdope.com/u/Shagnasty)\ **Post date:** [September 6, 2016, 8:43pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/2 "2016-09-06T20:43:10Z")
Californium-252 is hard to beat. It costs about $27 million dollars per gram. You could easily fit several billion dollars worth in a shoe box. It is highly radioactive but so is the plutonium referenced in the linked article. Californium is orders of magnitude more expensive than plutonium as well. ---
**Author:** ![Machine\_Elf](https://avatars.discourse-cdn.com/v4/letter/m/82dd89/32.png) [@Machine\_Elf](https://boards.straightdope.com/u/Machine_Elf)\ **Post date:** [September 6, 2016, 8:44pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/3 "2016-09-06T20:44:55Z")
According to [this list,](http://www.therichest.com/luxury/most-expensive/the-15-most-expensive-materials-in-the-world/) I’d suggest either diamond or californium. Might be hard to track down enough californium to fill a shoebox, but it has industrial uses and so must be legal (if restricted) to purchase. How big is a shoebox? 33x18x13cm = 7722 cubic centimeters? If Californium, your shoebox is worth about 208 billion dollars. If diamond, 1.5 billion dollars. ---
**Author:** ![Ignotus](https://avatars.discourse-cdn.com/v4/letter/i/ecc23a/32.png) [@Ignotus](https://boards.straightdope.com/u/Ignotus)\ **Post date:** [September 6, 2016, 9:29pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/4 "2016-09-06T21:29:29Z")
> [@Shagnasty](#): > > Californium-252 is hard to beat. It costs about $27 million dollars per gram. You could easily fit several billion dollars worth in a shoe box. It is highly radioactive but so is the plutonium referenced in the linked article. Californium is orders of magnitude more expensive than plutonium as well. The OP stipulated: > [@](#): > > 1. Contents must be legal to purchase in the USA without a prescription or special license. I doubt you can buy highly radioactive material without a special license… I would suggest looking for some rare, high purity, non-hazardous chemical. They fetch ridiculously high prices: for example, Sigma-Aldrich sells [guanosine 5’-triphosphate tris salt](http://www.sigmaaldrich.com/catalog/search?term=GTP&interface=All&N=0&mode=match%20partialmax&lang=en®ion=SE&focus=product) for € 11.385/500 mg. And GTP isn’t really all that rare in biochemistry use… ---
**Author:** ![dtilque](https://avatars.discourse-cdn.com/v4/letter/d/d6d6ee/32.png) [@dtilque](https://boards.straightdope.com/u/dtilque)\ **Post date:** [September 6, 2016, 9:32pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/5 "2016-09-06T21:32:07Z")
> [@Shagnasty](#): > > Californium-252 is hard to beat. It costs about $27 million dollars per gram. You could easily fit several billion dollars worth in a shoe box. It is highly radioactive but so is the plutonium referenced in the linked article. Californium is orders of magnitude more expensive than plutonium as well. What’s the critical mass of Cf-252? I suspect that, like plutonium, it’s less than a shoebox-sized amount. Also, have they even made a shoebox-amount (10-15 liters) of Californium total? The [wikipage on Cf](https://en.wikipedia.org/wiki/Californium) says > [@](#): > > Only two sites produce californium-252 – the Oak Ridge National Laboratory in the United States, and the Research Institute of Atomic Reactors in Dimitrovgrad, Russia. As of 2003, the two sites produce 0.25 grams and 0.025 grams of californium-252 per year, respectively. At those rates, it’ll take a very long time to produce 10 liters. ---
**Author:** ![bob\_2](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bob_2/32/3341_2.png) [@bob\_2](https://boards.straightdope.com/u/bob_2)\ **Post date:** [September 6, 2016, 9:48pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/6 "2016-09-06T21:48:03Z")
One problem is that the goods might cost a lot but not be worth much, like the in-app purchases in the article. But this might also extend to gold, diamonds or just about anything you can think of. There may be a point in the future when the public get wise and the bottom drops out of the diamond market and even the gold market is artificial. So what could we put in the box that would increase in value, even after, or maybe because of, an apocalypse. I vote for seeds. ---
**Author:** ![gnoitall](https://avatars.discourse-cdn.com/v4/letter/g/bb73d2/32.png) [@gnoitall](https://boards.straightdope.com/u/gnoitall)\ **Post date:** [September 6, 2016, 10:01pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/7 "2016-09-06T22:01:09Z")
Not strictly apropos of OP’s proposition, but much more ego-boosting: “footnote” 3 regarding the density of cocaine, reads as follows: > [@What If 108 Footnote 3](#): > > But wait—what **is** the density of cocaine? As usual, the Straight Dope Message Board folks are on the case; in [this discussion](http://boards.straightdope.com/sdmb/showthread.php?t=298784), they consult the CRC Handbook and Merck Index, before giving up and deciding that it’s probably about 1 kg/L, like most organic substances. They do, however, learn its boiling point and solubility in olive oil. So. Um. Yay for us as another valuable reference resource in the rarified world of exotic and dubious knowledge? ---
**Author:** ![usedtobe](https://avatars.discourse-cdn.com/v4/letter/u/ec9cab/32.png) [@usedtobe](https://boards.straightdope.com/u/usedtobe)\ **Post date:** [September 6, 2016, 10:40pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/8 "2016-09-06T22:40:50Z")
InkJet printer ink. ---
**Author:** ![Shagnasty](https://avatars.discourse-cdn.com/v4/letter/s/9dc877/32.png) [@Shagnasty](https://boards.straightdope.com/u/Shagnasty)\ **Post date:** [September 6, 2016, 10:47pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/9 "2016-09-06T22:47:35Z")
> [@usedtobe](#): > > InkJet printer ink. You can’t keep that in a shoebox. As soon as you close the lid, it disappears and you have to start all over. ---
**Author:** ![watchwolf49](https://avatars.discourse-cdn.com/v4/letter/w/e9c0ed/32.png) [@watchwolf49](https://boards.straightdope.com/u/watchwolf49)\ **Post date:** [September 6, 2016, 11:03pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/10 "2016-09-06T23:03:38Z")
Photographs of famous people doing naughty things with barnyard animals. 1,000 photos @ $2,000,000 each matches diamonds’ value. ---
**Author:** ![Little\_Nemo](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/little_nemo/32/3120_2.png) [@Little\_Nemo](https://boards.straightdope.com/u/Little_Nemo)\ **Post date:** [September 6, 2016, 11:06pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/11 "2016-09-06T23:06:04Z")
I know the OP ruled out digital content but if you did go that route (as xkcd did) would songs be the way to go? Wouldn’t e-book files like Kindle or Nook give you a higher total? They’re much smaller than music files and cost more individually. My quick estimate is they cost about 20,000 times as much per byte. So if you could fit $1,500,000,000 worth of iTune songs in a shoebox, you could alternatively fit $30,000,000,000,000 worth of Kindle books in one. ---
**Author:** ![Chronos](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/chronos/32/134_2.png) [@Chronos](https://boards.straightdope.com/u/Chronos)\ **Post date:** [September 6, 2016, 11:28pm UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/12 "2016-09-06T23:28:58Z")
**watchwolf** , if we go that route, we need for there to exist photos of a thousand different bestial celebrities. And if we allow digital content, then neither songs nor e-books are the way to go. You don’t need to store the artwork itself, just the license to the artwork. That’s where all the real value is, and depending on how the licensing is managed, could be stored in many fewer bytes. ---
**Author:** ![Buck\_Godot](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/buck_godot/32/6573_2.png) [@Buck\_Godot](https://boards.straightdope.com/u/Buck_Godot)\ **Post date:** [September 7, 2016, 12:33am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/13 "2016-09-07T00:33:34Z")
Although there may not be enough valuable ones to fill a whole shoe box, some room should probably be made for stamps. The [British Guiana One-Cent Black on Magenta](http://www.sothebys.com/magenta) sold for about 9 million, and 4 [Baden 9 Kreuzer Error stamps](http://www.findyourstampsvalue.com/rare.htm) add another 6 million dollars, it would be hard to beat 15 million for the size of 5 postage stamps. ---
**Author:** ![Dr.Strangelove](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/dr.strangelove/32/6613_2.png) [@Dr.Strangelove](https://boards.straightdope.com/u/Dr.Strangelove)\ **Post date:** [September 7, 2016, 1:56am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/14 "2016-09-07T01:56:33Z")
> [@Ignotus](#): > > I doubt you can buy highly radioactive material without a special license… In fact, you can purchase small quantities of americium-241 in any hardware store. It comes with a free smoke detector. The bulk cost of americium oxide is only ~$1500/g, though the cost in smoke detectors is roughly $35M. ---
**Author:** ![md2000](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@md2000](https://boards.straightdope.com/u/md2000)\ **Post date:** [September 7, 2016, 2:08am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/15 "2016-09-07T02:08:03Z")
> [@Chronos](#): > > **watchwolf** , if we go that route, we need for there to exist photos of a thousand different bestial celebrities. > > … Or Bill Gates and a thousand sheep? I agree, digital (or analog) media is cheating; for this game, it should be a commodity item, with enough resale market size (like diamonds or gold or cocaine) that it could be realistically re-sold. ---
**Author:** ![beowulff](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/beowulff/32/542_2.png) [@beowulff](https://boards.straightdope.com/u/beowulff)\ **Post date:** [September 7, 2016, 2:13am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/16 "2016-09-07T02:13:52Z")
Raw e7-2890 processor dice. ---
**Author:** ![OldGuy](https://avatars.discourse-cdn.com/v4/letter/o/3bc359/32.png) [@OldGuy](https://boards.straightdope.com/u/OldGuy)\ **Post date:** [September 7, 2016, 2:17am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/17 "2016-09-07T02:17:36Z")
How about the gem Painite it costs $300,000 per gram. It has a density of 4 grams per cubic centimeter. So it’s valued at $1.2 million per cubic centimeter. [http://www.geminjewels.com/five-gems-worth-diamonds/](http://www.geminjewels.com/five-gems-worth-diamonds/) ---
**Author:** ![RivkahChaya](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/rivkahchaya/32/8919_2.png) [@RivkahChaya](https://boards.straightdope.com/u/RivkahChaya)\ **Post date:** [September 7, 2016, 2:29am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/18 "2016-09-07T02:29:38Z")
All of the rarest coins, from the most rare, and most valuable, which can sell for millions at auction, and going down to the next most valuable, and the next, until the box is full. You would have all the extant coins from the Roman Empire with enough detail to ID, probably down to the most valuable of US coins, gold $20 coin that is unique (albeit, it might belong to the US mint, and there might be a rule about private possession, I’m not sure). You’d easily have over a billion dollars of coins in the shoebox. ---
**Author:** ![dtilque](https://avatars.discourse-cdn.com/v4/letter/d/d6d6ee/32.png) [@dtilque](https://boards.straightdope.com/u/dtilque)\ **Post date:** [September 7, 2016, 2:32am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/19 "2016-09-07T02:32:40Z")
It seems to me that packaging should also be a factor in this calculation. For instance, as I understand it, californium 242 comes in milligram or sub-milligram quantities, but it’s embedded in a plastic capsule or something like that. So you’d have to figure out how many capsules you can fit into the shoebox, besides finding out if you can get enough of them to fill it. And that’s ignoring the lead box they’re usually shipped in. Similarly expensive chemicals are usually shipped in small vials or other containers, but each one may only have a small quantity. Taking both availability and packaging into account, the shoebox will probably contain several kinds of things. Find the most expensive item in terms of $ per milliliter of the package and get as much of that as is available, then move on to the next. ---
**Author:** ![thirdname](https://avatars.discourse-cdn.com/v4/letter/t/d07c76/32.png) [@thirdname](https://boards.straightdope.com/u/thirdname)\ **Post date:** [September 7, 2016, 3:54am UTC](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224/20 "2016-09-07T03:54:31Z")
Antimatter. Wikipedia gives cost figures of 25 billion to 62.5 trillion dollars per gram. [Next page](https://boards.straightdope.com/t/xkcd-valuable-shoebox-revisited/765224.md?page=2)