Something momentous happened on Friday of last week. The greatest bull market in history likely came to its end. We are not talking about the U.S. stock market, but the U.S. treasury bond market. Before discussing what happened, let’s quickly revisit why the bond market is so important, and the way that interest rates work. Stock market valuations and price-to-earnings…

You have likely heard of Robinhood, the zero-commission stock trading app that exploded in popularity during the pandemic. (It was already popular pre-Covid, but lockdown boredom and stimulus checks sent sign-ups to new heights.) On Thursday, Jan. 28, Robinhood ignited bipartisan fury with its decision to restrict users’ ability to buy calls or shares in GameStop (GME), the stock at…