When Nietzsche praises egoism it is always in an aggressive or polemical way, against the virtues, against the virtue of disinterestedness (Z III "Of the three evil things"). But in fact egoism is a bad interpretation of the will, just as atomism is a bad interpretation of force. In order for there to be egoism it is necessary for there to be an ego.
[Louis] Brandeis had a very distinctive vision of political economy that he persuaded Woodrow Wilson to adopt in the 1912 election and that he largely enacted from the bench.