Based on your financial expertise, provide your response or viewpoint on the given financial question or topic. The response format is open.

Why does the share price tend to fall if a company's profits decrease, yet remain positive?
In a rational market, the market caps (total value of all shares of the company) should be determined by the expected future profits of the company, plus the book value (that is the value of all assets that the company holds). The share price is then calculated as market caps divided by number of shares - a company worth a billion dollar could have a million shares at $1000 each or a billion shares at $1 each or anything in between.  When profits drop, every investor has to re-think what the expected future profits of the company are. If all the investors say "I thought this company would make a billion profit in the next ten years, but based on the drop in profits I changed my mind and I think they will only make 500 million", then the share price drops. On the other hand, if profits dropped because of some predictable event, then that drop was already priced into the share price. If the profits dropped less than expected, the share price might even go up.  You can see the opposite effect: Share price might be very high because everyone expects huge growth in profits over the next ten years. If profits grow less than expected, the share price will drop. Share price depends on predicted future profits, not on profits today.