I asked bing chat (gpt4) to compare "The Moon is a Harsh Mistress" to "The Powers of the Earth".

The answer was pretty good, except it had a grammar error that only a human in the midst of editing could make:

"...The Powers of the Earth is about an ungoverned lunar settlement whose economy developed while Earth’s economy declined under a command-and-control economy engages in a struggle to stay free from Earth’s meddling bureaucracy."