What do you think will have the biggest impact on the stock markets this year?

For me, it's probably the replacement of the Fed Chair. If someone close to Trump were to take over, that independence could be undermined and there would be pressure to cut rates. In that case, I'd expect significant volatility and stocks could swing sharply up and down.

There may be several such events this year and everyone is watching slightly different things. I'd be glad to read what you consider to be the key factors.