Friday was a down day for the stock market, but major benchmarks didn’t slip too far from where they started the day. A drop in crude oil took prices back below $46 per barrel, igniting debate about whether the global economy is sufficiently strong. An accelerating rise in the value of the euro against the U.S. dollar also raised some concerns among investors looking for stability as central banks seek to remove financial crisis-era stimulus measures. Even though many market participants were downbeat today, some stocks did manage to post gains.