'Santa rally' hopes shatter on S&P 500 selloff
Bulls' hopes for a year-end rally in the S&P 500 were already on shaky ground following continued trade war noise surrounding the Huawei CFO arrest, but Friday's sell-off has likely put them to rest.
Head of FX Strategy
Summary: The S&P 500's breach of its 200-day moving average means that we should all take notice, simply because the US market is the single largest market and always the basic proxy for risk appetite.
Note the 40-week (200-day equivalent on the weekly chart) going back even further and the degree to which this level often is in focus: