What was Satan's trade?

Is there anything in spirit life corresponding to our trade and commerce?

No, no—where such is carried on evil must exist. There is nothing, having a tendency to evil permitted where I am. 

What could we trade in? 

I have no lands—no goods, which I can call my own. All is as free to me as it is to you. There is no such thing as personal property here. Each one is lord and master, for the time being only of the spot on which he sets his foot—that is all, for all here have an equal right to the soil—to all things. 

So, you see, there is no necessity for trade. 

We have all we wish for. We have our houses, but even these we do not call our own—they belong to our Lord and Master. The result of all this is we are all of one mind—there is no discord here. Serving him, whom we ever love, we are at all times ready to go forth cheerfully to the farthest part of his Kingdom on messages of love and truth. There is no holding back from this service. Love urges us on—we must go.

—Hafed, Prince of Persia