What does Zechariah 11:8 mean?

Their buyers slaughter them, and go unpunished. Those who sell them say, ‘Blessed be Yahweh, for I am rich;’ and their own shepherds don’t pity them.

For I will no more pity the inhabitants of the land,” says Yahweh; “but, behold, I will deliver the men everyone into his neighbor’s hand, and into the hand of his king. They will strike the land, and out of their hand I will not deliver them.”

So I fed the flock of slaughter, especially the oppressed of the flock. I took for myself two staffs. The one I called “Favor”, and the other I called “Union”, and I fed the flock.

Then I said, “I will not feed you. That which dies, let it die; and that which is to be cut off, let it be cut off; and let those who are left eat each other’s flesh.”

I took my staff Favor, and cut it apart, that I might break my covenant that I had made with all the peoples.

It was broken in that day; and thus the poor of the flock that listened to me knew that it was Yahweh’s word.