How has the severity and duration of business cycles changed over time in the United States?

What will be an ideal response?

Though it is a controversial subject, it appears that business cycles have become less severe over time. Recessions have certainly been shorter since World War II than they were before 1929. There is some disagreement about how severe they were before 1929, with Christina Romer arguing that measurement problems in the old data misled economists about how severe those recessions were. But others find that the old data is just about right and conclude that the business cycle is much less severe today.