Back in October 19, 1988, in response to Black Monday from a year earlier (the SEC is not known for fast turnaround times) a little known SEC rule came into effect, known as Rule 80B, and somewhat better known as "Trading Halts Due to Extraordinary Market Volatility" which set trigger thresholds for market wide circuit breakers - think a wholesale temporary market shutdown. According to Rule 80B (as revised in 1998), the trigger levels for a market-wide trading halt were set at 10%, 20% and 30% of the DJIA. Needless to say, a 30% drop in the market in our day and age when the bulk of US wealth is concentrated in the stock market, would be a shot straight to the heart of the entire capitalist system. Which is why the smallest gating threshold is and has always been the key.However, despite the revision, as anyone who traded stocks on that fateful day in May knows, the market-wide circuit breakers were completely ineffective and unused during the HFT-induced and ETF-facilitated flash crash of May 6, 2010. In turn, the SEC's flash crash response was to implement individual stock-level circuit breakers which however, instead of restoring confidence in the market, have become the butt of daily jokes involving freaked out algos. This was merely the most recent indication of how horribly the SEC's attempts to "regulate" a market it no longer has any grasp or understanding of, backfire on it. However, even that may pale in comparison to just how badly the SEC may have blundered yesterday afternoon, when it proposed yet another revision to its market-wide halt rule. And once again, instead of making traders and investors more comfortable that the SEC is capable and in control, the questions have already come pouring in: is the SEC preparing for another massive market crash?