Why does summer give investors and stock market speculators cold sweats?

After the rain comes the good weather... until the next downpour. And like that all summer long! This is the lesson that can be learned from the latest stock market sequence : on Friday, August 1st, the CAC 40 plunged by 2.91%, after the announcement of a rise in the unemployment rate in July in the United States; this Monday, the Paris index gained 1.14% in hopes of a rate cut by the American Federal Reserve. "Whether for the CAC 40 or the S&P 500, the flagship American index, August and September are historically the most volatile and worst-performing months of the year," notes John Plassard, head of investment strategy at Cité Gestion Private Bank. Since 1945, in fact, the S&P 500 has shown an average variation of -0.07% in August, and -0.73% in September, according to data from CFRA Research cited by Reuters. Is summer really the horribilis season for the stock markets?

The “summer curse” is in any case a heavy trend that is repeating itself…