Tumbling crypto prices appear to have played a part in disappointing overall trading volume results for Robinhood (HOOD). The brokerage app reported crypto volume of $28.6 billion in November, down 12% from October's $32.5 billion. That amount was also down 19% from year-ago levels, when crypto was surging thanks to Donald Trump's election victory. Bitstamp, the crypto exchange Robinhood agreed to acquire earlier this year, also saw volumes fall 11%. As for equity trading volumes, they struggled as wel ...