Mdthbs

For almost one year now, I closely observed developments on stock markets. I mainly focused on major indices such as Dow Jones and DAX (I am from Germany). Both indices suffered losses during the hot phases of the "trade war" between the US and China, but recovered when there were signs of relaxation.

Imagine the following scenario for a president of the United States (POTUS):

1. Start a trade war.


2. Buy when stock prices are low.


3. Proclaim agreement (or any sign of relaxation)


4. Take the profits after markets react positively.

Is there any mechanism that would prevent such a scenario? Undoubtably, the POTUS' actions can have a large impact on stock markets. I would consider any investments made by a POTUS insider trades. Is the POTUS even allowed to act on the stock markets?

Is there potential for the President of the United States to commit insider trading? Certainly. The President has access to all kinds of material information that is non-public, either because it’s classified, confidential, or not yet cleared for public consumption.

Some examples of material information that the President could have access to before the general public:

• Knowledge of the progress of trade talks (Have we made a breakthrough? Is the other side insisting on something that we’re never going to accept? Is this negotiation a priority for the administration, or will we drop it if we don’t get a great deal?)


• More critically, what is actually in these deals, before they’ve been publicly released? What concessions were extracted? What did we agree to? These details can have a huge effect on many industries.


• The decisions of departments under the control of the Executive Branch like the EPA, FDA, or FAA


• The President’s own decisions, for example, if the President knows they will institute tarrifs. (Though there is a lot of overlap with manipulation here)

Is there any mechanism to prevent this? No, aside from public outrage and the democratic process.

Until the current administration, every president in the modern era has voluntarily put their assets into a blind trust to prevent corruption (including insider trading) or the appearance of corruption. In a blind trust, one’s assets are being actively managed, but the owner is not aware of how they are invested and cannot control or influence their management. In this situation, insider trading is impossible since the President cannot actively manage their investments.

This policy is not a law or rule, though, it was just a tradition; and there’s nothing stopping a president from refusing to do so (as President Trump has), in which case insider trading would be easy to carry out. NOTE: I am not aware of any evidence that Trump has engaged in insider trading or stock market manipulation, but it would be trivially easy for him to do so.

So, what mechanisms can prevent this? It’s unlikely that the SEC could bring charges, even if they wanted to, as the President is likely protected by executive privilege. Pretty much the only options would be Impeachment or being voted out of office by a public outraged by a President who used their office to enrich themselves. As @Accumulation pointed out, the STOCK Act makes insider trading by politicians and government employees illegal, but without an enforcement mechanism that applies to the President, the only remedy remains Impeachment or getting voted out.

According to wikipedia,

In the United States, Canada, Australia and Germany, for mandatory reporting purposes, corporate insiders are defined as a company's officers, directors and any beneficial owners of more than 10% of a class of the company's equity securities.

So if the president does not fall under any of those categories, then he or she would not be a "corporate insider". However:

The provision of the Stock Act was a compromise in which government officials were required to disclose trades to the public in exchange for being able to trade in the first place. If disclosure proved too burdensome, government officials could simply adopt personal no-trading policies and avoid the cost of disclosing trades altogether.
The new law scraps the disclosure requirements for the staffers, leaving them in place only for members of Congress, Congressional candidates, and the President and Vice President.

https://www.cnbc.com/id/100647407

So it appears that the president would at the very least have to disclose the trades.

Insider trading requires non-public material information. It doesn't sound like anything in your scenario is non-public though. Maybe if an agreement had been made but not made public and then the President bought the stocks and then she or he announced the agreement that could be insider trading.