It has been changed several times. That's why I take it with a grain of salt so to day, although if you are spiritually involved in the Lent, your body actually refuses to eat just anything.
For example, if a married priest was being considered for elevation to Bishop, could economia be used to allow it? Or, would this simply never happen?
No. Celibacy of Bishops is not subject to oikonomia (economy). They must devote their life entirely ot the Church, which is why most Bishops are drawn from monastic ranks, but some widowers have been elevated to that rank.
Thanks for the info.