If there is no accident, the last week of December is likely to be bullish. This is not what I said casually, but a law discovered by a lot of research on Wall Street: The Santa Claus rally is a very specific event. It is the tendency for the market to rise in the last five trading days of the current year and the first two days of the new year. First discovered by Yale Hirsch of “Stock Trader’s Almanac,” it has produced positive returns 34 of the past 45 years for an average return of 1.4%. During the month of December, the S&P 500 tends to peak during the last week or even the last day of the month, according to Jessica Rabe, co-founder of DataTrek Research. “Since 1980, the S&P’s December high happened during the last week of this month in almost half (41 pct) of years,” she sai