How quickly will American businesses reopen after COVID-19 lockdowns end? We use a nationwide survey of small businesses to measure firms' expectations about their re-opening and future demand. A plurality of firms in our sample expect to reopen within days of the end of legal restrictions, but...

Linear Econometric Models with Machine Learning -- Nonlinear Econometric Models with Machine Learning -- The Use of Machine Learning in Treatment Effect Estimation.-Forecasting with Machine Learning Methods.-Causal Estimation of Treatment Effects From Observational Health Care Data Using Machine...

Part I:- Discrete (Combinatorial) Optimisation -- Chapter 1:-Bilevel Discrete Optimisation: Computational Complexity and Applications -- Chapter 2:-Discrete Location Problems with Uncertainty -- Chapter 3:-Integrated vehicle routing problems: A survey -- Chapter 4:- The knapsack problem and its...