Is Now the Time to Buy Robinhood Stock?

Discount broker Robinhood Markets (HOOD 1.26%) has quickly established itself as an important force in the brokerage industry. Offering free trades, for example, led to a massive change in the way brokers competed on cost. The stock has been getting investor attention lately, and it more than doubled over the past year, even after a large pullback during the market swoon.Is that pullback an opportunity, or does it highlight a potential risk with Robinhood?What does Robinhood do?From a big-picture perspectiv ...