Trump will ensure he and his acolytes make a healthy profit on trading gold/ETF's/currency as he controls the decision making which controls the markets.
Then he will reverse the decision (i.e. chicken out) to broadly put the markets back in the position they were and profit-take. (Of course, the money he has sucked out of the market has come from ordinary people's pension funds so when he and his buddies win, others have to lose)
Self-enrichment, on an unimagineable scale, is one of his key aims during his second term.