Download the U.S. GDP time series and comment on the dynamics of growth rates in recessions versus expansions. Follow the NBER dating of recessions from 1955 to date. Describe how long recessions and expansions last and any other features that describe the U.S. business cycle.(Use Derivations, formulas, diagrams, tables and reports)

Note:- Don't even try to copy paste Chegg answer of this question here as they are absolutely wrong .. Otherwise I will have to report your account..So please don't do it if you don't have deep knowledge of economics.