If a man, before he passed from one stage to another, could know his future life in full detail, he would have nothing to live for. It is the same with the life of humanity. If it had a programme of the life which awaited it before entering a new stage, it would be the surest sign that it was not living, nor advancing, but simply rotating in the same place.
The middle class is not doing well, and trade policy might have something to do with that, and so someone who is going to be fixated on those things, who has a business background, has some appeal.