I think what was meant was "If you're in a high paying, in demand field, save more aggressively (in absolute terms) than if you're in a low paying field with li

I think what was meant was "If you're in a high paying, in demand field, save more aggressively (in absolute terms) than if you're in a low paying field with limited opportunities." Since you're getting paid more, you can put away more money while saving a smaller fraction of your paycheck.