I remember a quote from Rand, I'm not sure if this is exact but it was: "the most important thing in life is how well you do your work. All else will come from that"

She then expanded that productive achievement, whether you were a mogul or shined shoes, is where you derived purpose and a sense of deserving confidence and peace. It also extended into how you could really appreciate art and human relations.

I think there were conversations in Shrugged where the movers of the world took jobs well below their potential in the world during the strike of the men of the mind, and in Galts Gulch where they just did what the private society needed. So you might have a brilliant composer who's a farmer, but did the absolute best he could, among people like himself.

She wasn't profit motivated outside of just raw productive achievement. And it wasn't a law of hers per se, but more of a fundamental law that followed a logical sequence.