Will it be the end of the EU and the euro? These are all very dramatic questions that keep focus off the American situation, which is probably even worse.
High-frequency trading is electronic trading based on mathematical models that make the decisions. Investment firms compete on the basis of speed, capturing gains on a fraction of a penny, and perhaps holding positions for only a few seconds. These are not long-term investors. Content with their daily earnings, they close out all positions at the end of each day.