Just as nature abhors a vacuum, investors abhor uncertainty. That is what is driving the market this week as we (still) await Fed chair Janet Yellen’s speech at the Jackson Hole Economic Policy Symposium.

Fed Chairwoman Janet Yellen’s speech in front of important central bank executives from around the world is fast approaching.

Two key releases of data are the true underlying fundamentals driving markets today. Certainly another little upward bump in the price of oil has helped stimulate U.S. equities, but it is the data that really counts.