The president and the Fed have enormous power over the economy. If they spoke carelessly and spooked the markets, they could cause a crash any day of the week.

The president and the Fed have enormous power over the economy. If they spoke carelessly and spooked the markets, they could cause a crash any day of the week. Look at what happened in the UK in their small economy, and imagine how much worse it would be if the US president did it. The Fed's low rates are also largely responsible for the way the economy behaved since 2008.