The stock market goes up, the world is good. The more liquidity for business, for liquidity for investors. You pull that mobile down, not as good because now all of a sudden we feel a little less happy, bankers, investors are a little more concerned, things tighten up.
The answer is D. It's all supply and demand. What the people want, and who can provide it the quickest and nicest way possible.
Hope I Helped. :)