Now, making a comparison to a mainstream commodity option requires a little work on the back of an envelope.
In his tent, Butterfield jotted musical notes on the back of an envelope.
Some of his notes, scratched on the back of an envelope, still exist, here in New York, at the Morgan Library.
Liberal Democrat AM Peter Black accused Mr Sargeant of drawing up his proposals for legislation "on the back of an envelope".
Only a few years ago, Chinese outfits preferred contracts you could write on the back of an envelope and wriggle out of at will.
ECONOMIST: China's cup overflows; India catches the spillage
Anyone who has ever jotted down a note on the back of an envelope and promptly lost it might be interested in Google's latest offering, Keep.
Obviously, when you have a business the scope of ours, it's not something you can do on the back of an envelope, and it's not something you can do in three weeks.
The transport secretary called for Labour to "demonstrate whether they are serious about reducing costs to passengers" instead of "tinkering at the edges with uncosted commitments drawn up on the back of an envelope".
Irritated by the waffle that often surrounds discussions of energy and climate change, Mr MacKay, a physicist at Cambridge University, has chosen to illustrate the challenge of breaking our fossil-fuel addiction armed only with the laws of physics, reams of publicly available information and the back of an envelope.
To handle that, the team placed an envelope on the back of the computer screen that is pre-paid and addressed to the nearest facility that can recycle those three elements.
Extending this forward through our forecast period, a back-of-the-envelope calculation suggests an upside of around 15% to our price estimate for NYT stock.
FORBES: NYT's Online Paywall Has More Ups Than Downs For Stock
This thought came to me when I watched a commercial for a company that encouraged people to mail in their gold jewelry with the promise of an envelope with a fat check mailed back to them.
FORBES: Seller beware: don't give away the store when selling
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