refers to the change in total revenue that results from producing and marketing one additional unit of the product
Dolly is the name of a sheep that has the honor of being the first mammal to be cloned by a group of scientists in England. Dolly was born July 5th, 1997 and she passed away in 2003. She lived for 6 and a half years, as a normal, active ewe.
Angel was named after Rob Renzetti's pet rabbit, and shares his name with a G1 Earth pony mare. As Lauren Faust revealed on DeviantArt on August 30, 2011 and at Equestria LA 2015, Angel was originally going to be a mouse named Mortimer.