Jesus Christ was not just God, he was a Man, teaching other Men, in a time far less enlightened than ours. The Golden Rule wasn't, strictly speaking, his either- it was borrowed from other traditions. But in a time of tribalism being disrupted and every man for himself, it was pretty good:
Do unto others as you would have them do unto you
or I've also heard it interpreted as
Love others as you love yourself
The problem with this is, it doesn't cover cynical depressed bastards like myself. I don't expect others to do unto me at all, and in my experience, when they do it's usually at some cost to myself. Likewise, loving others as I love myself is pretty awful.
So, in what no doubt some would consider my blasphemy, trying to improve upon Christ himself, but to me is simply summing up Supreme Knight Carl Anderson's ideas in A Civilization of Love, may I suggest the following:
Give unto others more than you would have them give unto you.
If we adopted *THAT* as our highest economic law, we'd be much better off.