Just for the record, those aren't the first letters the Greek alphabet, nor are they in order, given that alpha is shortly after omega and both are near the cen

Just for the record, those aren't the first letters the Greek alphabet, nor are they in order, given that alpha is shortly after omega and both are near the center of the list. I assume they follow some standard of usage in context, but I don't know enough about economics to know what they're normally used to represent.