variant. treasury secretary january net yellen talks about how we don t know enough information yet to assess what the real risk is to the economy, but she said the best protection is for people to get vaccinated and to take their booster shots. jerome powell, chairman of the federal reserve, he did address some of the risks facing the economy. here s what he had to say. the recent rise in covid-19 cases and the emergence of the omicron variant pose downside risks to the employment and economic activity and increased uncertainty for inflation. reporter: increased uncertainty for information, worries about slower job growth, slower economic activity. he talked about how supply chain issues could get worse before getting better. on the stock market, the dow hit session lows, down about 530 points, 1.5%. the market is reacting to some