Micah and Isaiah were calling out the same sinful behavior. For example,
Listen! The Lord is calling to the city—Dishonest scales is such a specific version of exploitation to be called out. I hear echoes of campaign finance reform reading Micah's condemnation that "the judge accepts bribes, the powerful dictate what they desire—they all conspire together."
and to fear your name is wisdom—
“Heed the rod and the One who appointed it.
Am I still to forget your ill-gotten treasures, you wicked house,
and the short ephah, which is accursed?
Shall I acquit someone with dishonest scales,
with a bag of false weights?
Your rich people are violent;
your inhabitants are liars
and their tongues speak deceitfully.
The work of the prophets was the work of the social justice activists.
Why did exploitation of the poor lead to the fall of Israel? Was it necessarily divine intervention?