What guideline should be used in determining whether a joint product should be sold at the split-off point or processed further?

Yes. It does depend on context: exclamation marks are heavily used in emails by many people, such usage would be deemed irrational in more formal writing. It does reduce the impact of the exclamation...

ETC should be kept on unless you have a reason to turn it off. Consult with your owners manual to see the specific reasons to turn it off. (i.e. Stuck in mud or snow)

When using "who" and "whom" in the English language, one must remember that most people have absolutely no idea when to use them. If you would like a more in-depth answer than what is provided below,...

Yes, that's the best thing. It's almost impossible to glue the split ends back together, and if you don't cut them off the hair will continue to split. You don't have to cut off much more than just...

Some environmental pollutants may be harmful to a developing baby. Here's a list of them: Lead: In gasoline, water pipes, solders, storage batteries, construction material, paints, dyes and wood...