The typical sales price of an existing family home in the United States in December: 372,700. The number of layoffs in the tech sector since the beginning of the year: 76,000. The number by which consumer spending fell in December: 0.2 percent. The increase in the cost of the same kind of carton of eggs bought by an editor on “The Daily” a year apart: 251 percent. What do these numbers tell us about the state of the country’s economy? Guest: Ben Casselman, an economics and business reporter for The New York Times.