Answer:
The correct answer is Decrease.
Step-by-step explanation:
The external factors of uncertainty cause a collapse of the value of the shares in the stock market, by increasing the level of skepticism according to any adverse situation in the market that causes a drop in the negotiation of the titles. An investor generally in this scenario will try to take care of their assets by trading the shares at a lower value, which directly affects the earnings of the owner of the share.