Envy

Envy

"Jealousy involves three parties, the subject, the rival, and the beloved; and the jealous person's real locus of concern is the beloved—the person whose affection he is losing or fears losing—not his rival. Whereas envy is a two party relation, with a third relatum that is a good (albeit a good that could be a particular person's affections); and the envious person's locus of concern is the rival. "

Nice philosophical discussion of envy...
how it differs from jealousy,
whether it is the genesis of egalitarian justice, etc...
good stuff