[kosta50]

The Latin original, by the way, says "consilium"

I am not sure I follow you, Alex. What does consilium have to do with God "planning?"

I don't see what is so good about "economy", it is an awkward term, at least given the modern connotations

The "economy of our salvation," in short, is how God revealed himself to man, namey as three different Hypostatic realities, and how each reality revealed what man should do to be saved. That's all. That's not "planning"; that's doing.

Needless to say, the economy of man's salvation is about as much a corruption of Judaism as Mormonism is of Christianity.

[annalex]

You are thinking of the meaning the word is mostly used in English, a group that deliberates.

consilium: A conclusion made with consideration, a determination, resolution, measure, plan, purpose, intention

Lewis and Scott

But the Catechism doesn't say a Muslim has to convert

Because formal conversion may or may not happen. We believe in sovereignty of God, who, in His mercy can act in non-ritualistic ways.