This week's current events:

• Trump dominates in the Iowa caucuses
• Congress passes another continuing resolution to keep the government open
• Republicans and Democrats are in intense negotiations over immigration reform and Ukraine aid
• Migrants are starting to work as they get permits
• The U.S. hit Houthi targets with over 100 precision strikes, but the Houthis retain most of their attack capacity
• A Republican and a Democrat released a package bill that includes an expanded child tax credit
• China's population declined for a second straight year within a culture that deters making a family

In this week's deep dive, we looked into two teams of economists that have differing views regarding how much income inequality has grown in the U.S. in recent decades. It's a fundamental aspect of progressives' story of the state of the country so it seems pretty important to get it right. We then transition from there to have a broader discussion about what economic metrics matter and why.