See this question.
When a stock price shifts suddenly there is probably some underlying reason, and frequently the price shift is the result of some new information - a technological breakthrough, a government deal, etc.
One might argue that in the answer "The company can expect higher profits from now on because of XY" the economic reasoning is all in the part before XY, therefore revealing XY is not really economics. (Unless XY itself is a complicated economic phenomenon, e.g., a change in market structure.)
One might also argue that economics based explanations are always/usually on-topic.
Are questions that ask for financial market commentary off-topic?